1 00:00:00,540 --> 00:00:07,770 Hello there. I'm Marianne Tolba, time director of studies in philosophy at Oxford University's Department of Continuing Education. 2 00:00:07,770 --> 00:00:12,120 We're about to start a six week course called Critical Reasoning for Beginners. 3 00:00:12,120 --> 00:00:18,600 And we're going to go through looking at how to recognise an argument. What arguments are the different types of arguments? 4 00:00:18,600 --> 00:00:25,860 That's deduction and induction. And we'll be looking at how to set out arguments, logic, books style, how to analyse them. 5 00:00:25,860 --> 00:00:28,110 Then we'll be looking at how to evaluate them. 6 00:00:28,110 --> 00:00:34,590 And finally, we'll look at fallacies, which are arguments that look like good arguments, but which are bad arguments. 7 00:00:34,590 --> 00:00:42,500 Okay, so we're going to start off on the first week with how to recognise arguments and what the nature of an argument is. 8 00:00:42,500 --> 00:00:47,970 Right. Okay, let's get started. You're all here to do critical reasoning. 9 00:00:47,970 --> 00:00:52,410 Okay. Why? Why? Why do you want to do critical reasoning company? 10 00:00:52,410 --> 00:01:00,830 You tell me what she wants. Or what do you think you can't see now that he wants to source. 11 00:01:00,830 --> 00:01:05,190 Shot my sense of argumentation, Shelton, your sexual orientation. 12 00:01:05,190 --> 00:01:10,800 Is there anyone you want to argue with in particular? Policy wise? Yes. 13 00:01:10,800 --> 00:01:19,650 It won't work. You know, you've been married to Bill. I just just turned speaking up, particularly with arguments and debate. 14 00:01:19,650 --> 00:01:25,650 Right. Okay. So I'm gonna live here. Someone detect the flaws in other people's arguments. 15 00:01:25,650 --> 00:01:31,070 You won't be able to detect the flaws in other people's arguments. Okay. What about your own arguments? 16 00:01:31,070 --> 00:01:38,340 Know that, too, because that's very important. These are one of the things I'll talk about today is something called the principle of charity. 17 00:01:38,340 --> 00:01:41,910 And you'll see why. Well, far, that's what I said. 18 00:01:41,910 --> 00:01:46,290 And I want to get lost. That's a valid point. 19 00:01:46,290 --> 00:01:57,030 So to actually be a conviction, what I'm saying, if I believe it, not someone more intellectual and eloquent beat things down. 20 00:01:57,030 --> 00:02:05,820 Right. Say love with one thing that will help. I mean, it won't do the trick completely because, of course, a lack of confidence has to come from you. 21 00:02:05,820 --> 00:02:09,460 But it will help to feel that you know where you are in arguments that you try. 22 00:02:09,460 --> 00:02:21,360 So I call for the fact that I read the Thomas more. 23 00:02:21,360 --> 00:02:27,740 And I think that's how I came to philosophy. Funny enough to say something like that, so I did an open university course. 24 00:02:27,740 --> 00:02:33,890 I was a mature student, not very mature, 26. And I thought it was an open university course. 25 00:02:33,890 --> 00:02:42,990 They did logic in those days, formal symbolic logic. And I tried to do this logic and I found it so difficult, really, really difficult. 26 00:02:42,990 --> 00:02:47,070 And I sat up all night and still trying to do it. 27 00:02:47,070 --> 00:02:50,300 And in the morning I realised that I've had such a much nicer night, 28 00:02:50,300 --> 00:02:55,070 much better night than I've had with all sorts of other things you might stay up all night to do. 29 00:02:55,070 --> 00:02:58,830 I really enjoyed it. And that's what got me into philosophy in the first place. 30 00:02:58,830 --> 00:03:06,620 I came out through an of school at 50 and I came on here eventually, eventually took quite a long time. 31 00:03:06,620 --> 00:03:11,650 But I had never lost my love of philosophy. I've never lost my love of learning. 32 00:03:11,650 --> 00:03:20,390 And that's all down to philosophy. This confidence, you have an argument because if you can learn how to argue properly, you can. 33 00:03:20,390 --> 00:03:22,610 Nothing is hidden from you. 34 00:03:22,610 --> 00:03:32,330 In principle, it's always possible to tease out the arguments and to evaluate the arguments and to take yourself that step further. 35 00:03:32,330 --> 00:03:36,200 And so I hope that after this series of six lectures, of course, 36 00:03:36,200 --> 00:03:40,850 you're not going to go away knowing all about logic and knowing all about how to reason properly. 37 00:03:40,850 --> 00:03:47,090 But I hope not all done by that time is giving you more confidence and giving you a feeling for the fun it can be so that you'll 38 00:03:47,090 --> 00:03:55,430 go away and start looking yourself and not be very happy to pass on to reading or give some other ideas of how you might do that. 39 00:03:55,430 --> 00:03:59,300 Right. Okay. Let me tell you about Monty Python. 40 00:03:59,300 --> 00:04:04,130 I'm sure some of you know about it, but what it is, is that it's called the argument clinic. 41 00:04:04,130 --> 00:04:12,160 And one man, I've got to say, goes in and says John Cleese sitting there and he says, is this the place for arguments or something like that? 42 00:04:12,160 --> 00:04:17,050 Jesus, whatever it is or not. 43 00:04:17,050 --> 00:04:20,990 Well, no, you haven't. Yes. No, you haven't. Yes, I have. 44 00:04:20,990 --> 00:04:24,750 And this goes on this is almost arguing you're contradicting me. 45 00:04:24,750 --> 00:04:28,880 And John Cleese says, no. No, you're not. Yes, you are. 46 00:04:28,880 --> 00:04:33,160 And so it goes on, then presses a bell. That's the end of the sessions. 47 00:04:33,160 --> 00:04:38,000 But that wasn't five minutes. Yes, it was. Yes, it was. 48 00:04:38,000 --> 00:04:45,500 I'm not talking to things and so on. And that was supposed to be an amusing introduction. 49 00:04:45,500 --> 00:04:52,160 But what I wanted to move on to is the idea that John Cleese had it wrong. 50 00:04:52,160 --> 00:05:00,590 Of course, it isn't a set of contradictions. It isn't a set of just you say one thing and I say another that doesn't get us anywhere. 51 00:05:00,590 --> 00:05:08,270 Part of the point of argument is to move this on from where we are to somewhere a bit further. 52 00:05:08,270 --> 00:05:14,240 Just imagine if the only way we could find out about the world was through our senses. 53 00:05:14,240 --> 00:05:24,050 If if we could see one thing and form one belief, but not take that belief and move on to it to another belief. 54 00:05:24,050 --> 00:05:27,890 So you could say that that's blue and the carpet's blue, 55 00:05:27,890 --> 00:05:34,730 but you couldn't say when two things are the same colour they match, therefore that the chair and the carpet match. 56 00:05:34,730 --> 00:05:40,250 Do you see what I mean? Argument takes us from where we are to to where we want to be. 57 00:05:40,250 --> 00:05:49,160 Or sometimes where we don't want to be. We'll never get very far without argument. 58 00:05:49,160 --> 00:05:57,590 Yes. If I can. Well, thank you so much. 59 00:05:57,590 --> 00:06:08,120 This is great. I mean, we're awash with technicians here. 60 00:06:08,120 --> 00:06:16,310 Okay, so let's have a look at the definition of argument. An argument is a set of sentences, and I put sentences there after you wouldn't believe it, 61 00:06:16,310 --> 00:06:23,350 spending half an hour wondering whether short statements, propositions, all expressions of statements or something. 62 00:06:23,350 --> 00:06:27,410 But I'm pretty sentences anyone who wants to quarrel with that's most welcome to do so. 63 00:06:27,410 --> 00:06:36,590 A set of sentences such that one of them was being said to be true and the others are being offered as reasons for believing the truth of the first. 64 00:06:36,590 --> 00:06:39,110 Okay, that's all there is to an argument. 65 00:06:39,110 --> 00:06:48,380 I put others with the S in brackets here because of course we might say that one thing is true on the basis of just one other sentence. 66 00:06:48,380 --> 00:06:54,050 So his argument, it's Friday. Marijan always wears jeans on a Friday. 67 00:06:54,050 --> 00:06:59,090 So Mahram will be wearing jeans today. Okay, that's a set of sentences. 68 00:06:59,090 --> 00:07:04,130 That is, as a matter of fact, no arguments. Okay, what are the sentences? 69 00:07:04,130 --> 00:07:09,650 Tell me what the sentences are. This is an easy question. So allowing you into a false sense of security. 70 00:07:09,650 --> 00:07:13,520 That's right. It's Friday. That's one sentence. Okay. 71 00:07:13,520 --> 00:07:18,260 It's I've got Komaroff tricks up on straight onto the sentence. 72 00:07:18,260 --> 00:07:27,040 But that doesn't matter. This Friday is a sentence. Okay, next one I told you is easy money and always wears jeans on a Friday. 73 00:07:27,040 --> 00:07:31,660 That's right. So next one area, I thought you are in jeans today. 74 00:07:31,660 --> 00:07:35,440 OK. Those are the sentences that make up the argument. Exactly. 75 00:07:35,440 --> 00:07:40,570 So. Now, here's a bit of tech technology terminology for you. 76 00:07:40,570 --> 00:07:47,320 Technology focus cells a conclusion. Is the sentence being said to be true? 77 00:07:47,320 --> 00:07:52,400 And the premises are the sentences being offered as reasons for believing the other one. 78 00:07:52,400 --> 00:07:57,160 OK. Remember, that might be just one. That might be just one premise. That doesn't need to be, too. 79 00:07:57,160 --> 00:08:00,410 That could be 20 premises. But. 80 00:08:00,410 --> 00:08:06,100 But what makes something a premiss and what makes something a conclusion is the role that they're playing in the argument, 81 00:08:06,100 --> 00:08:11,450 the function that they're performing. So here's the argument again. 82 00:08:11,450 --> 00:08:17,530 What's the conclusion of the argument? That's right. 83 00:08:17,530 --> 00:08:22,570 Yeah, that's the conclusion, because that's the one we're saying is true. 84 00:08:22,570 --> 00:08:29,390 And what are the premises? That's right. 85 00:08:29,390 --> 00:08:33,490 So there are two premises to this argument and one conclusion. OK. 86 00:08:33,490 --> 00:08:42,440 Very simple stuff. So that's the conclusion. It read mine would be wearing jeans today on the premises in green. 87 00:08:42,440 --> 00:08:48,280 It's very important to distinguish arguments from sets of sentences. 88 00:08:48,280 --> 00:08:52,870 Let's see how to do that, because an argument is a set of sentences, but it's more than that. 89 00:08:52,870 --> 00:08:58,300 There's more to an argument than the set of sentences question. But how do you feel about. 90 00:08:58,300 --> 00:09:03,640 I wanted to ask about this one. Does it matter which order they come? I'm very happy to take questions. 91 00:09:03,640 --> 00:09:09,040 If I think they're going to go on too long, I'll shut you up and put you into the question time. 92 00:09:09,040 --> 00:09:13,530 Or if I think it's complicated or something, but otherwise I plan to go on. 93 00:09:13,530 --> 00:09:22,300 Well, the question then is presumably one sentence as a premise depends on another, because it's Friday. 94 00:09:22,300 --> 00:09:27,520 You know the Marijan in that particular argument. 95 00:09:27,520 --> 00:09:34,690 Yes, that's a good question. Let's go back to it. I actually I'm very happy for you to ask questions, because if you do, 96 00:09:34,690 --> 00:09:39,570 it might be a clarification, clarification question like that one, which is quite useful. 97 00:09:39,570 --> 00:09:44,260 And if you look at that, let's get to that one. 98 00:09:44,260 --> 00:09:50,860 If you take out that premise, you might still have an argument. 99 00:09:50,860 --> 00:09:55,240 You say it's Friday. So, Marianne, we'll be wearing jeans today. 100 00:09:55,240 --> 00:10:01,060 But what have you done? Left the implication you are making decisions, right? 101 00:10:01,060 --> 00:10:06,790 That's right. You've left a suppressed premise, haven't you? Because that wouldn't be a good argument. 102 00:10:06,790 --> 00:10:14,380 It would still be an argument, actually, because you'd still be giving one sentence as a reason to believe another one. 103 00:10:14,380 --> 00:10:20,500 But it wouldn't be it wouldn't be an argument that could possibly be convincing were it not for that. 104 00:10:20,500 --> 00:10:25,090 So we often leave premises suppressed in an argument. 105 00:10:25,090 --> 00:10:34,940 But usually when because of the context or because of something that we can assume, we assume that the person knows the other one. 106 00:10:34,940 --> 00:10:40,210 So if we all knew if you knew that every time. 107 00:10:40,210 --> 00:10:47,590 Well, that every Friday I wear jeans, if you will, knew that that would be an argument without the second premise. 108 00:10:47,590 --> 00:10:54,010 So thank you for that. If people didn't have that assumption is that we turned them on separate. 109 00:10:54,010 --> 00:10:58,210 Yes. Yeah. Well done. We'll say something more about what sectors? 110 00:10:58,210 --> 00:11:03,880 Not today, probably, but later, of course, you could actually say Northwest News on Friday. 111 00:11:03,880 --> 00:11:08,340 She was wearing jeans today. You leave out. There you go. 112 00:11:08,340 --> 00:11:11,680 That's right. Yes, you could. 113 00:11:11,680 --> 00:11:15,890 You could. I mean, that would be a different argument, but it would be an argument. 114 00:11:15,890 --> 00:11:26,420 Yes. You can change the rules, say my friend, Jean Shorts. 115 00:11:26,420 --> 00:11:33,250 Yeah. All right. Well, move, move. 116 00:11:33,250 --> 00:11:37,690 That would be a false argument. Hold that one. We'll come back to that in a minutes. 117 00:11:37,690 --> 00:11:46,480 You'll see. What does it say about that? I just want to note that, OK, I'm going to move on because, yes, you can make an argument out of it. 118 00:11:46,480 --> 00:11:52,120 Well, let me just move on and show you exactly what I'm going to say. OK. 119 00:11:52,120 --> 00:11:55,110 It's important to take the arguments from sets of sentences. 120 00:11:55,110 --> 00:12:03,790 Six sentences that are not arguments might either have no relation of told between them or they may have between over any relation. 121 00:12:03,790 --> 00:12:10,240 Other than that characterising an argument, for example, a set of sentences might be consistent, 122 00:12:10,240 --> 00:12:16,000 i.e. such that they could be true together without being an argument. 123 00:12:16,000 --> 00:12:20,920 Do you see what I mean? Or they could be related by all referring to. 124 00:12:20,920 --> 00:12:27,160 What's your name? Mike. Mike. They could be related in that way without being an argument. 125 00:12:27,160 --> 00:12:36,010 Do you see what I mean? Lots of different ways. Sets of sentences can be related. But the relation in order to be one at all humans, it's got to. 126 00:12:36,010 --> 00:12:40,570 What is it? 127 00:12:40,570 --> 00:12:51,010 So to say good in order to be an argument has got to be one sentence that's that you're putting forward as being true. 128 00:12:51,010 --> 00:12:55,450 And the other sentences or sentence is a reason for believing that thing. 129 00:12:55,450 --> 00:13:01,330 That's the relation that characterises an argument. Nothing else. 130 00:13:01,330 --> 00:13:05,250 Here's two sets of sentences. That isn't an argument. The sea is salt. 131 00:13:05,250 --> 00:13:10,750 Melbourne's in Australia, but it's very easy to make it an argument. 132 00:13:10,750 --> 00:13:18,420 The sea is salt. Therefore, Melbourne's in Australia. Now, do you think I've made that an argument or not? 133 00:13:18,420 --> 00:13:22,440 No, I'm not saying it's up also. 134 00:13:22,440 --> 00:13:28,630 Gosh, no. That particular one. And I think you'll see one saying this. 135 00:13:28,630 --> 00:13:32,490 It's a wash. There's no link between. 136 00:13:32,490 --> 00:13:38,460 So. So you think that my putting therefore it doesn't make it an argument. 137 00:13:38,460 --> 00:13:43,360 Okay, let me tell you a little story. Okay. We're we're doing a panel show. 138 00:13:43,360 --> 00:13:51,970 Okay. We've got to find out things and find out other things and then come up and we'll win a huge prise. 139 00:13:51,970 --> 00:13:57,040 Now, we're particularly ignorance contestants here. 140 00:13:57,040 --> 00:14:05,260 We don't. Whether the sea salt. We don't know whether Melbourne's in Australia. But we do know that if one of these census is true, so is the other. 141 00:14:05,260 --> 00:14:10,570 OK. That's all we know. We know. We know if one of these censuses is true, says the other. 142 00:14:10,570 --> 00:14:14,530 So now we've got to find out whether one whether either of these census is this truce. 143 00:14:14,530 --> 00:14:17,590 A half an hour and a half of us run off to see whether the sea salt. 144 00:14:17,590 --> 00:14:22,750 Now, the Hoffs run off to find out for the Mauldin's in Australia and the Melton's in Australia. 145 00:14:22,750 --> 00:14:27,890 Sorry to see Assault's ones come back first. They say the sea salt. Melbourne's in Australia. 146 00:14:27,890 --> 00:14:32,320 Hey, is that's an argument which we know. 147 00:14:32,320 --> 00:14:44,410 That's a good argument, isn't it? What I'm doing there is it's I'm giving a reason, I'm saying Melbourne isn't in Australia is true on site, 148 00:14:44,410 --> 00:14:52,060 and I'm giving a reason for believing it, namely the truth of the seas being sold. 149 00:14:52,060 --> 00:14:56,910 Fair enough. This is an argument. And what. 150 00:14:56,910 --> 00:15:06,190 Okay. It was an argument before I gave you the context, actually, because arguing is something that we do with sentences. 151 00:15:06,190 --> 00:15:11,290 Okay. It's it's we do them because of all sorts of things to do with our backgrounds. 152 00:15:11,290 --> 00:15:19,960 What we've just found out, our desires, our hopes of is our intentions, things like that, arguing something we do and we can do it in any way. 153 00:15:19,960 --> 00:15:31,030 This is why the idea of artificial intelligence, which was talked about a great deal a few years ago, is getting, frankly, nowhere. 154 00:15:31,030 --> 00:15:38,100 And the reason it's getting nowhere is human beings can see the relevance once the context is provided. 155 00:15:38,100 --> 00:15:41,590 Such a computer so far can't see. 156 00:15:41,590 --> 00:15:45,580 I mean, fingers crossed that we will be able to deal with this one. 157 00:15:45,580 --> 00:15:50,130 But the fact is, I mean, it's I think in the context you can see the argument is, can't you? 158 00:15:50,130 --> 00:16:07,780 Some of it not. Is this just context or is it an implicit sentence that the fact that we have explicitly said both must be true if one is true? 159 00:16:07,780 --> 00:16:14,710 You're right. You're absolutely right. That, in fact, you might say there are a lot of you could say there's a suppressed premise in there, 160 00:16:14,710 --> 00:16:22,150 which is that if the sea is salt, then Melbourne is in Australia. That and I've given that by giving the context, if you like. 161 00:16:22,150 --> 00:16:31,220 So if we were game contestants in that situation, I wouldn't have to give that suppressed premise because we would all know it. 162 00:16:31,220 --> 00:16:36,610 But again, well done. No, I think that's the point at the backrest premises assignment context. 163 00:16:36,610 --> 00:16:47,320 No, no, no. It provides in the context. I enables us to see the suppressed premise, if you like. 164 00:16:47,320 --> 00:16:51,570 Because just at the moment, there's no suppressed fantasy that we can see. 165 00:16:51,570 --> 00:16:57,130 I mean, we don't see why that's an argument you won't deny. It wasn't the argument because you can't see the relevance between the two. 166 00:16:57,130 --> 00:17:06,430 What I did was make one relevant to the other. And in doing so, I provided you with the premise that that was suppressed. 167 00:17:06,430 --> 00:17:13,720 So there's a suppressed premise, which is a sentence because the premises are always sentences. 168 00:17:13,720 --> 00:17:23,720 And that's what I provided by providing the context. I'm struggling with that because that's all right. 169 00:17:23,720 --> 00:17:29,720 This has happened in Australia, not because the sea salt, but because this is true. 170 00:17:29,720 --> 00:17:34,670 I know this is very interesting. OK. Very interesting question. 171 00:17:34,670 --> 00:17:37,790 What's your confusing? I apologise. 172 00:17:37,790 --> 00:17:52,430 Is causation and entailment the premises, the premises, the premises of an argument do not cause the conclusion to be true. 173 00:17:52,430 --> 00:18:01,400 OK, if that's the premise and that's a premise. Do you think that what's caused me to wear jeans today is these two things? 174 00:18:01,400 --> 00:18:08,570 Not necessarily. I mean, it might be or it might be that actually I wear jeans on a Friday because to 175 00:18:08,570 --> 00:18:13,450 commemorate the first pair of jeans that my mom ever bought me or something, 176 00:18:13,450 --> 00:18:18,500 I think you would think of a reason for making Hideaways Jeans Day. 177 00:18:18,500 --> 00:18:32,010 I might wear jeans every day. Yes, exactly. So. So the fact that A and B together entails C doesn't mean that A and B cause C. 178 00:18:32,010 --> 00:18:37,910 OK. And when you say that the C is salt doesn't cause Melbourne to be in Australia, you're quite right. 179 00:18:37,910 --> 00:18:45,410 But say that the C is salt. Therefore, Melbourne in Australia isn't implying causation of any kind. 180 00:18:45,410 --> 00:18:53,380 OK. What do you do. Oh you ignore them. 181 00:18:53,380 --> 00:19:00,080 What. Again, that's a very good question. I'm glad you asked that. Let's go to Mrs Salt on this. 182 00:19:00,080 --> 00:19:06,020 Well, actually we could do it with a Marijan one as well because there are lots of people called Marianne off of me in the world. 183 00:19:06,020 --> 00:19:11,250 All it means is if Marianne is there anywhere else called Marianne in this room. 184 00:19:11,250 --> 00:19:18,230 All right. Put out the end if your call, John. This is the second time this has happened to me. 185 00:19:18,230 --> 00:19:22,460 Okay. There are no johns in this room. Let's just make your mike. 186 00:19:22,460 --> 00:19:27,020 Is there anyone else called Mike? Like to Mike's in this room. 187 00:19:27,020 --> 00:19:30,500 If I was if I say Mike is tall. Okay. 188 00:19:30,500 --> 00:19:35,180 Then that's ambiguous, isn't it? It has two meanings. I could be referring to that, Michael. 189 00:19:35,180 --> 00:19:39,550 That Mike. One of you may be short. In which case to be false. 190 00:19:39,550 --> 00:19:47,030 One, the truth. The other. But what I've actually got here is two sentences. 191 00:19:47,030 --> 00:19:52,730 How complicated. I'm going to get here. There's a type of sentence. 192 00:19:52,730 --> 00:19:59,650 I have no penance. Believe it or not. That was another thing that fell off the list. 193 00:19:59,650 --> 00:20:07,130 Would you mind? You can't see this. 194 00:20:07,130 --> 00:20:11,570 Yes, you can imagine it. Okay. Mike is told. 195 00:20:11,570 --> 00:20:16,490 What it says. Now, if I could actually get Mike, let's put Johnny's tool there. 196 00:20:16,490 --> 00:20:22,310 Now, if I put Johnny's tool up there that has no meaning, doesn't it, 197 00:20:22,310 --> 00:20:29,150 in the context of this room, in the sense that there's nobody to whom John refers as we know. 198 00:20:29,150 --> 00:20:35,840 OK. But I could use that since it's Johnny's tool to say something inside in the same way. 199 00:20:35,840 --> 00:20:40,650 Here is a census type that could be used to say things. 200 00:20:40,650 --> 00:20:49,730 And I could use this type of sentence to say Mike his tool, or I could use the same sentence to say Mike his tool. 201 00:20:49,730 --> 00:20:54,500 But those are two different tokens of the same type of sentence. 202 00:20:54,500 --> 00:20:58,640 See what I mean? So just as that's one token of the type chair. 203 00:20:58,640 --> 00:21:02,000 That's another one. And this is one token of the type human being. 204 00:21:02,000 --> 00:21:06,830 And that's another one. Mike is tall is one, too. 205 00:21:06,830 --> 00:21:11,810 That's type of sentence. And Mike, his tool is another token of that type of sentence. 206 00:21:11,810 --> 00:21:19,480 So actually, if you have to Melvins, you can have two arguments that that could be. 207 00:21:19,480 --> 00:21:30,080 It could either be. This is salt. Therefore, Melbourne, which is in the Northern Territory, is in Australia or Melbourne, which is in. 208 00:21:30,080 --> 00:21:35,090 Thank you. Victoria is in Australia for a Norwegian board. 209 00:21:35,090 --> 00:21:41,260 Well, no, not in Derbyshire, because that would falsify that one, wouldn't it, unless there's a Darbyshire in Australia. 210 00:21:41,260 --> 00:21:54,200 And so that. Six folks. 211 00:21:54,200 --> 00:22:03,290 I'm going to hold over that question and I'm going to take it together with your claim that the arguments false. 212 00:22:03,290 --> 00:22:09,830 Okay. And I'll come back to it shortly. OK. 213 00:22:09,830 --> 00:22:17,450 So arguing is something that we do with sentences weak at any sentences could form part of an argument. 214 00:22:17,450 --> 00:22:22,210 There's no such thing as a sentence that couldn't be part of an argument. 215 00:22:22,210 --> 00:22:28,880 What makes it an argument is the fact that we are making an argument claim we're putting forward 216 00:22:28,880 --> 00:22:34,850 one sentence and we're offering the other sentences as reasons to believe that sentence. 217 00:22:34,850 --> 00:22:40,820 So you cannot recognise arguments by recognising the sentences that are in arguments. 218 00:22:40,820 --> 00:22:47,690 You've got to recognise the relation between the sentences. OK, let's look at these. 219 00:22:47,690 --> 00:22:51,410 Which of these sentences are arguments? Right. 220 00:22:51,410 --> 00:22:57,820 Who thinks that this is an argument? OK. 221 00:22:57,820 --> 00:23:02,610 No one else. OK. Why do you think that's an argument? He's making assumptions. 222 00:23:02,610 --> 00:23:09,410 The storm broke the clouds in the sky and the storm broke because the clouds formed the back. 223 00:23:09,410 --> 00:23:17,590 Does that make it an argument? He calls. 224 00:23:17,590 --> 00:23:26,040 That that we had, because it's very difficult, because distinguish causes and reasons for something. 225 00:23:26,040 --> 00:23:29,730 OK. There can be a causal relation between two events. 226 00:23:29,730 --> 00:23:36,290 So a causal relation between two events. 227 00:23:36,290 --> 00:23:46,480 And that can be a rational relation between two sentences or two beliefs. 228 00:23:46,480 --> 00:23:52,390 OK. And we tend to use because at the both of these types of relation, 229 00:23:52,390 --> 00:24:01,300 that these are causes and these are reasons and you weren't making that up and you shouldn't be worried about making this area because it was a very, 230 00:24:01,300 --> 00:24:07,210 very common one. You were thinking of the causal relation as a rational relation, but it's not, is it? 231 00:24:07,210 --> 00:24:13,960 Okay, so that's not an argument, because always saying is that actually three events happened, don't we? 232 00:24:13,960 --> 00:24:18,220 Firstly, clouds formed, then the sky blackens, then the storm broke. 233 00:24:18,220 --> 00:24:24,180 And there may be a causal relation between them, but we're not saying that these two are reason for believing. 234 00:24:24,180 --> 00:24:29,000 The other always with me is what is this argument? 235 00:24:29,000 --> 00:24:32,770 Put your hands up. If you say yes. Yes. Okay. 236 00:24:32,770 --> 00:24:42,930 Which is a conclusion based on the premises. 237 00:24:42,930 --> 00:24:50,060 That's right. Matisses Northmont said Edinburgh's North Boxwood, sorry, because it's North Manchester. 238 00:24:50,060 --> 00:24:52,500 It was north of Oxford, is the conclusion. 239 00:24:52,500 --> 00:24:59,970 So this one is since Manchester is north of Oxford and Edinburgh's North Manchester, Edinburgh is north of Oxford as it grows north of Oxford. 240 00:24:59,970 --> 00:25:05,060 It's the conclusion. The other two of the premises. That's definitely an argument. 241 00:25:05,060 --> 00:25:09,480 Okay. Which is float because which is a piece of wood and wood floats. 242 00:25:09,480 --> 00:25:15,720 It's not an argument or not. Put your hands up if you think there's an argument. That's my argument. 243 00:25:15,720 --> 00:25:21,270 You're quite right. What's the conclusion? Which is float. 244 00:25:21,270 --> 00:25:27,090 Okay. And then the premises are. Which you say would float. 245 00:25:27,090 --> 00:25:31,990 That's right. Notice that the conclusion is that the front here doesn't make any difference, does it? 246 00:25:31,990 --> 00:25:39,680 Because what makes the sentence a conclusion? It falls from the military front. 247 00:25:39,680 --> 00:25:43,560 No. Because it might not follow from the other two premises. It might be a bad argument. 248 00:25:43,560 --> 00:25:51,450 What makes something a conclusion? Because no one does that in a sentence. 249 00:25:51,450 --> 00:26:01,250 Well, I ceramicist if even if you wanted to prevent argument one, it wouldn't have done for long somebody to say that's true. 250 00:26:01,250 --> 00:26:06,620 And so what you're saying is true. That's right. You'll see. You'll say this is true because of the others. 251 00:26:06,620 --> 00:26:11,580 Whether because as a rational. Because those are causal defaults. Okay. 252 00:26:11,580 --> 00:26:20,890 Let me tell you again, the only thing that makes a sentence, a conclusion or a premiss is the role that it's playing in the argument. 253 00:26:20,890 --> 00:26:28,860 Okay. If it's playing the role of being the the sentence for which you're arguing, then it's a conclusion. 254 00:26:28,860 --> 00:26:36,620 And if it's playing the role of a sentence for which the story which you're offering is a reason for leaving the other one, then it's a premise. 255 00:26:36,620 --> 00:26:45,290 Okay. That's the only thing that makes sense. It's a premise or a conclusion. Not true. 256 00:26:45,290 --> 00:26:48,980 Well, we'll come to truth in a minute. Truth is, you're quite right. 257 00:26:48,980 --> 00:26:59,540 The truth is very important, but not just yet. Notice instead that there's no there's no reason why a sentence is playing. 258 00:26:59,540 --> 00:27:05,870 The role of a conclusion in one argument can't play the role of a premise in another argument. 259 00:27:05,870 --> 00:27:06,530 Do you see what I mean? 260 00:27:06,530 --> 00:27:13,190 That's why it's very important that what makes them of premise or a conclusion is the function of playing the role they're playing. 261 00:27:13,190 --> 00:27:18,320 Not anything intrinsic to the sentence. Music is intrinsic to the sentence. 262 00:27:18,320 --> 00:27:24,620 You'd have a sentence that could only be a conclusion. Which should be rather odd, wouldn't it? 263 00:27:24,620 --> 00:27:29,280 I'm not sure their office some that I might think of, one that I call off the top of my head. 264 00:27:29,280 --> 00:27:34,430 So. So what makes a sentence? A conclusion is that you are arguing for it. 265 00:27:34,430 --> 00:27:39,720 What makes it a premise is that you are using it to argue for something else. 266 00:27:39,720 --> 00:27:48,680 OK. Is this argument hands up? If you think it is. Could be a plans to. 267 00:27:48,680 --> 00:27:59,550 It's an even more difficult one, isn't it? If it were a conclusion which would prove that if it were an argument, which would be the conclusion. 268 00:27:59,550 --> 00:28:09,770 Okay. So then the premise would be Jesse James left town and Jesse James took his gang with him so we could say Jesse James left town. 269 00:28:09,770 --> 00:28:15,410 Jesse James took his gang with him. Therefore, things have been a lot quieter. 270 00:28:15,410 --> 00:28:20,540 There's an implied promise about that. Jesse James and his gang. 271 00:28:20,540 --> 00:28:26,270 We can make ends meet on our own. Yes. I don't think that's an argument myself. 272 00:28:26,270 --> 00:28:30,660 I think it's just a concatenation of sentences. 273 00:28:30,660 --> 00:28:36,080 I several sentences strung together. As it might there might be a problem. 274 00:28:36,080 --> 00:28:40,760 In fact, there could be is a causal relationship to. Isn't that why things quater? 275 00:28:40,760 --> 00:28:44,360 Because Jesse James left town and taken it's taken his gang with them as well. 276 00:28:44,360 --> 00:28:50,330 Not just an explanation are now explanations, reasons and causes. 277 00:28:50,330 --> 00:28:57,350 Now you're really getting into the interesting stuff. Explanations can be both causal and rational, can't they? 278 00:28:57,350 --> 00:29:02,200 So I can give an explanation of your behaviour that's rational. 279 00:29:02,200 --> 00:29:07,370 All right. We'll get an explanation of your behaviour. That's causal. So what's your name? 280 00:29:07,370 --> 00:29:11,960 Paul. Paul. Okay, so the reason Paul did that was whatever. 281 00:29:11,960 --> 00:29:16,370 Or Paul did that because. What's your name? Jenny. 282 00:29:16,370 --> 00:29:19,620 Jenny pushed him. Just pushed it. 283 00:29:19,620 --> 00:29:25,850 Paul fell over. Okay. All Paul fell over because he was trying to make the children laugh. 284 00:29:25,850 --> 00:29:30,650 Juicy ones. A rational explanation. And the other's a causal explanation. 285 00:29:30,650 --> 00:29:35,810 Causes reasons and explanations are intimately tied together. 286 00:29:35,810 --> 00:29:48,170 And we'll talk about probably quite often in these sessions. But the important thing is that it might be that that not all causes are reasons. 287 00:29:48,170 --> 00:29:56,780 It may be those or reasons of causes. But it's not the case that all causes the reasons because some causes are non rational. 288 00:29:56,780 --> 00:30:02,840 They have no reasons involved in them at all. Anyway, this is getting complicated and you don't need to worry about this. 289 00:30:02,840 --> 00:30:08,270 The important thing is that a set of sentences is only an argument if you're putting 290 00:30:08,270 --> 00:30:14,000 one forward is true and putting the others forward as reasons for believing the one. 291 00:30:14,000 --> 00:30:22,090 That's what an argument is. So if a set of sentences doesn't have that relation between them, it isn't an argument. 292 00:30:22,090 --> 00:30:29,510 It's one of the reasons why the Thomas class increased. 293 00:30:29,510 --> 00:30:35,840 So it may be just coincidence. Yes, you may not be saying there's even a causal relationship here. 294 00:30:35,840 --> 00:30:39,280 You know, actually, since Jessie Davis left town to his gang with him, 295 00:30:39,280 --> 00:30:45,630 things have been a lot quieter because it's not been necessary to do this stuff or the other. 296 00:30:45,630 --> 00:30:49,900 Yes. But you could very back on track with that, wasn't it? 297 00:30:49,900 --> 00:30:53,560 Well, as I said, you know, supply context in which anything is an argument. 298 00:30:53,560 --> 00:31:02,800 So that's true. Young is a certain of cynicism is subjective or object to. 299 00:31:02,800 --> 00:31:08,170 Is it a matter of opinion? Well, is it. 300 00:31:08,170 --> 00:31:15,990 I mean, if we go back to I mean, you can answer this question yourself. If we go back to that one, is it a matter of opinion that that's an argument? 301 00:31:15,990 --> 00:31:20,170 Or did I somehow make it an argument? 302 00:31:20,170 --> 00:31:29,510 I mean, did I make it appear to be an argument or did I make it an argument? 303 00:31:29,510 --> 00:31:35,680 Estimated appear to be an argument by making its arguments. Yes. 304 00:31:35,680 --> 00:31:40,960 And therefore it became an argument or rather, you started to see that it was an argument. 305 00:31:40,960 --> 00:31:47,770 Is that right? So objective and subjective. 306 00:31:47,770 --> 00:31:55,390 When I used to teach undergraduates, I used to say that I wouldn't let me use those words until that third year because they're very difficult words. 307 00:31:55,390 --> 00:32:02,740 And the reason they're very different, difficult words is because there are objective facts about subjective thing. 308 00:32:02,740 --> 00:32:06,160 If you think of the subject of state as the state of the subject, 309 00:32:06,160 --> 00:32:11,610 state happiness or something like that, then there are objective facts about such states. 310 00:32:11,610 --> 00:32:16,180 And know you are happy. No, you're not. That's a bad example, actually. 311 00:32:16,180 --> 00:32:22,120 Happiness anyway. You see what I mean? I guess I will reject an argument because I say it off. 312 00:32:22,120 --> 00:32:27,480 I don't think it's not. Or do you mean it's got a lot of argument? 313 00:32:27,480 --> 00:32:31,870 Well, that's. I was just going to make that distinction. Okay. Two questions you might ask. 314 00:32:31,870 --> 00:32:39,450 That isn't an argument or that isn't a good argument. Not clear. 315 00:32:39,450 --> 00:32:48,790 Clearly, you can make a distinction that claim whether the person making it. 316 00:32:48,790 --> 00:32:54,040 That's an interesting one. If you mind, I'd leave that on one side because I'll think about what I think about that. 317 00:32:54,040 --> 00:33:00,730 I'm not sure of a feeling you say, yes, it is. 318 00:33:00,730 --> 00:33:07,080 But then you'd have to provide the context which would make it clear to the other person that it's an argument. 319 00:33:07,080 --> 00:33:11,270 Okay, let's move on, because we've sort of turned your back to John, please. 320 00:33:11,270 --> 00:33:17,860 John, please. What did he say? Oh, that's not an argument. 321 00:33:17,860 --> 00:33:24,010 Indeed, he did say that. That's right. That's not an argument. And what he meant by that is that's just a contradiction. 322 00:33:24,010 --> 00:33:27,850 You have just two sentences, one which contradicts the other. 323 00:33:27,850 --> 00:33:32,140 That's not an argument. And that's an argument against. But it's not arguments against. 324 00:33:32,140 --> 00:33:39,370 The truth of this is this is the argument gets the truth of. That's an argument. Oh, clarity of thought. 325 00:33:39,370 --> 00:33:44,320 It's wonderful. All right, let's move on. OK. 326 00:33:44,320 --> 00:33:49,950 There are often words that suggest there's a set of sentences as an argument. 327 00:33:49,950 --> 00:33:58,750 When we looked at these and we saw that you so wanted to because in there, because that would have convinced you it was no argument. 328 00:33:58,750 --> 00:34:08,320 Should it have done? No, not necessarily, because it does sometimes in an argument, but not always. 329 00:34:08,320 --> 00:34:16,330 Okay. Where's the argument? Word in this one. 330 00:34:16,330 --> 00:34:20,980 Okay. What about that one. So. 331 00:34:20,980 --> 00:34:30,400 Yeah, OK. Can you give me any more if ah if there is a difficult one. 332 00:34:30,400 --> 00:34:33,880 The answer is. Well I shall. I'll talk about. 333 00:34:33,880 --> 00:34:40,540 That's going to minute. I will put it on one side because you've got some system in which between imputation and entitlements. 334 00:34:40,540 --> 00:34:43,990 But we'll do that in a minute. Hence is a good one. 335 00:34:43,990 --> 00:34:48,340 Yeah. Even given that then. Yeah. 336 00:34:48,340 --> 00:34:55,920 Then there's another one that's a bit iffy actually. Therefore is very definitely an argument word. 337 00:34:55,920 --> 00:35:01,560 Yeah. And since that is that there are words that we consequently. 338 00:35:01,560 --> 00:35:03,460 Yeah. OK, let's leave that. 339 00:35:03,460 --> 00:35:11,150 So to firstly we've, we've said what's an argument is and we've said how to distinguish an argument from a set of sentences. 340 00:35:11,150 --> 00:35:18,810 But we've also got to distinguish an argument from an assertion, just a straightforward assertion. 341 00:35:18,810 --> 00:35:25,410 Okay. An argument is a set of sentences, just one of which is being asserted. 342 00:35:25,410 --> 00:35:30,250 Okay. And this session is a single sentence, possibly a complex sentence. 343 00:35:30,250 --> 00:35:35,270 It might be Marans wearing jeans. And it's Friday. So that's one sentence. 344 00:35:35,270 --> 00:35:42,070 Conjoined with a sentence conjunction. And that's being expressed in that it's esoteric move. 345 00:35:42,070 --> 00:35:49,420 So which of these sentences are or could be assertions? 346 00:35:49,420 --> 00:35:57,700 Number one is only number one. Exactly. So I say it could be because, of course, it could be said, I could say the room is hot. 347 00:35:57,700 --> 00:36:02,040 That's Australian intonation. That makes it a question. Do you see what I mean? 348 00:36:02,040 --> 00:36:08,530 So so I could ask a question in the form of words that would usually be used for Asatru. 349 00:36:08,530 --> 00:36:13,810 So, again, remember, that language is something we use and we can use it in all sorts of different ways. 350 00:36:13,810 --> 00:36:19,380 But this is a this sentence has interrogative force, doesn't it, is the root cause. 351 00:36:19,380 --> 00:36:29,020 And this has imperative force turn the heat up. That one is being used as historically, not the others. 352 00:36:29,020 --> 00:36:34,420 Some assertions and this will pick up the point you would make there. Looks very like arguments. 353 00:36:34,420 --> 00:36:43,630 If it's snowing, the mail will be late. Okay, so you might think that this is an argument because it's an if then sentence. 354 00:36:43,630 --> 00:36:50,040 Why isn't that an argument? Can anyone tell me the story? 355 00:36:50,040 --> 00:36:59,320 Well done. Yes, it is its assertion that Professor Marcus may not always be true. 356 00:36:59,320 --> 00:37:03,070 Okay, I'll use my brother. Is it good? Okay. 357 00:37:03,070 --> 00:37:07,430 All we asserting it is snowing. No. 358 00:37:07,430 --> 00:37:11,110 Always searching the mail will be late. No. 359 00:37:11,110 --> 00:37:15,370 Always assessing. If it snowed, the mail will be late. Yes. 360 00:37:15,370 --> 00:37:21,430 So there's only one sentence there, isn't there? It happens to be complex. 361 00:37:21,430 --> 00:37:28,930 It's a it's a sentence. That's the sum. Sententious parts are themselves intentional. 362 00:37:28,930 --> 00:37:33,610 But it's not an argument because it doesn't satisfy the description, does it? 363 00:37:33,610 --> 00:37:40,330 It doesn't satisfy the the claim that there must be a sentence that's being put forward is true and 364 00:37:40,330 --> 00:37:45,700 other sentences that have been put forward to support the claim that that one sentence is true. 365 00:37:45,700 --> 00:37:50,710 So that's an entail. Sorry, that's not an implication. 366 00:37:50,710 --> 00:37:57,320 Not an entailment. Okay, so that's it. 367 00:37:57,320 --> 00:38:01,830 Snow, you apply to mail. We'll be late. It doesn't entail that the mail won't be late. 368 00:38:01,830 --> 00:38:08,500 Husband's back. An argument. 369 00:38:08,500 --> 00:38:13,190 What does make is ungrammatical, actually. Therefore, it is snowing, the mail will be late. 370 00:38:13,190 --> 00:38:16,220 Sorry, not the place, was it the other way. 371 00:38:16,220 --> 00:38:25,780 Therefore, that would make it an argument because the therefore signals entailment then can signal entailment. 372 00:38:25,780 --> 00:38:33,180 But it doesn't automatically, but therefore going to say something very fash there. 373 00:38:33,180 --> 00:38:39,160 That will always does not make you like that. OK. 374 00:38:39,160 --> 00:38:46,480 So we need to distinguish things like that from arguments. 375 00:38:46,480 --> 00:38:52,580 Now we guess also the bit that's been worrying around the central room here. 376 00:38:52,580 --> 00:38:57,220 OK. Think about assertions. Is that either true or false? OK. 377 00:38:57,220 --> 00:39:04,360 Now, this is an interesting thing. There are only two sorts of things that can be true or false in this world. 378 00:39:04,360 --> 00:39:09,520 One of them is beliefs. Beliefs are either true or false. 379 00:39:09,520 --> 00:39:15,190 And the other is the sentences that we use to express beliefs. 380 00:39:15,190 --> 00:39:22,000 OK. So if I believe that the chair is blue, I can express that belief in the sentence. 381 00:39:22,000 --> 00:39:30,700 The chair is blue and both the belief and the sentence used to express it can be either true or false. 382 00:39:30,700 --> 00:39:35,940 Are you with me? Can you think of anything else that can be true or false? 383 00:39:35,940 --> 00:39:42,020 That's. No facts of what makes sentences true or false. 384 00:39:42,020 --> 00:39:46,010 They are not themselves true or false. They just exist or don't exist. 385 00:39:46,010 --> 00:40:01,890 So the fact that that chair is blue makes true the sentence that Chair Blue would make a joke about her hair. 386 00:40:01,890 --> 00:40:10,530 When you say that, you say. What about the fact or that sentence and that sentence? 387 00:40:10,530 --> 00:40:17,910 Well, that's not true or false, isn't it? I mean, if you're. I mean. 388 00:40:17,910 --> 00:40:21,870 Let me just point out some ambiguity. What what's your name? Yes. 389 00:40:21,870 --> 00:40:25,610 I said, what about. What did you say? 390 00:40:25,610 --> 00:40:34,940 Her hands. Blonde hair is blonde. 391 00:40:34,940 --> 00:40:41,100 If I put it like that, I'm talking about the fact on. Whereas if I took it, do that. 392 00:40:41,100 --> 00:40:47,460 I'm now talking about the sentence. Right. If I take those out again. 393 00:40:47,460 --> 00:40:56,820 That's not the sort of thing can be that can be true because the fact that someone's hair is blonde, that her hair is blonde makes true the senses. 394 00:40:56,820 --> 00:41:01,320 Her hair is blonde. You. Difficult stuff. 395 00:41:01,320 --> 00:41:10,930 Philosophy isn't it. But but the really nice thing is that if you persevere with logic, you two will be able to do things like this. 396 00:41:10,930 --> 00:41:17,680 You know, these distinctions are there to be made. Do you just need the clarity of thought to be able to make them that? 397 00:41:17,680 --> 00:41:23,140 Because facts are just always true. Facts aren't true at all. 398 00:41:23,140 --> 00:41:35,280 Fatfat Are what make sentences. True facts, either of facts, if you like, of combinations of things or events or things or properties and events. 399 00:41:35,280 --> 00:41:40,160 So if you think it's something like her hair is blonde. That's a fact. 400 00:41:40,160 --> 00:41:48,210 OK. Her hair is being blonde. Her jacket's being green is a green. 401 00:41:48,210 --> 00:41:55,020 It would fit right in. Whether that's a fact or not, we're not really sure. 402 00:41:55,020 --> 00:41:59,060 A story. A fact of the matter, which is. 403 00:41:59,060 --> 00:42:04,290 Sorry, I didn't mean that. Diana's Jacobins history. 404 00:42:04,290 --> 00:42:14,220 These are facts which either exist or not. I mean, some people might say that that's not a fact, that Diana's jacket is great. 405 00:42:14,220 --> 00:42:22,320 The sentence that expresses that, the belief that that's a fact is false. 406 00:42:22,320 --> 00:42:37,830 Sorry I lost myself in the beginning of that sentence. The sentence with words, which is made with facts in that sentence, refers to a fact, 407 00:42:37,830 --> 00:42:45,590 if you like, even that which is in that context, beyond that question. 408 00:42:45,590 --> 00:42:49,200 Oh, I see it referred to a potential fact. A putative fact. 409 00:42:49,200 --> 00:42:52,590 Yes, that's right. Yes, of course. I know. That's a thank you. 410 00:42:52,590 --> 00:42:58,500 That's a very good point to make, because if I say something false. What makes it false? 411 00:42:58,500 --> 00:43:04,710 It's a fact. But it's not the fact. So if I say that Charles Black. 412 00:43:04,710 --> 00:43:14,190 The fact of the chairs not being black is what makes that useful. 413 00:43:14,190 --> 00:43:19,470 It gets difficult, as you can see. But the thing to remember is this. 414 00:43:19,470 --> 00:43:23,760 There are three different levels that are very important. 415 00:43:23,760 --> 00:43:26,490 You have to keep separate in thinking clearly. 416 00:43:26,490 --> 00:43:36,380 And of course, all critical reasoning involves clarity of thought that these levels of the level of language. 417 00:43:36,380 --> 00:43:47,640 Fort. And the thing I always call reality, but that's that's wrong because, of course, language and thoughts are real. 418 00:43:47,640 --> 00:43:52,080 So so that's completely wrong. But I keep using it that way. 419 00:43:52,080 --> 00:43:59,400 So if I put down Red Oak and I put quotes around so that you make it clear, make it clear that today is a word. 420 00:43:59,400 --> 00:44:04,130 Okay. It's a linguistic item. Then there's the concept. 421 00:44:04,130 --> 00:44:09,800 Red Oak. It's what I think that is red. 422 00:44:09,800 --> 00:44:16,770 OK. I'm using the concept red. And then there's redness, the property. 423 00:44:16,770 --> 00:44:20,880 So these three things are quite different from each other, aren't they? 424 00:44:20,880 --> 00:44:26,960 So if I say this is the property of being red. 425 00:44:26,960 --> 00:44:36,040 OK. I'm talking about this. And if I'm thinking about this pen as being red, then I'm exercising my concept of red. 426 00:44:36,040 --> 00:44:40,480 And if I see this is red, then I'm using the word red. 427 00:44:40,480 --> 00:44:47,820 Nurses in French. It would be a different word, wouldn't it? But the same concept on the same property. 428 00:44:47,820 --> 00:44:52,230 So there's an all the tree elements in language. Isn't that in the other two? 429 00:44:52,230 --> 00:44:57,510 So what's the French roof? I think. 430 00:44:57,510 --> 00:45:03,870 I'm glad I use red. Not something else. I'm sorry. 431 00:45:03,870 --> 00:45:12,750 Could you speak a word of the red? I mean, some people might say this is metaphysics. 432 00:45:12,750 --> 00:45:19,970 One day one. They can't be true. 433 00:45:19,970 --> 00:45:27,880 It's all true. They know. 434 00:45:27,880 --> 00:45:36,770 Right. That's what you're talking about here in terms of facts and truths and so on. 435 00:45:36,770 --> 00:45:45,370 OK. What you're suggesting is that what I see is Red Mike might see as orange, green or something else. 436 00:45:45,370 --> 00:45:50,180 OK. So what we're saying is, why isn't anyone wearing red? Will somebody please come next time wearing red? 437 00:45:50,180 --> 00:45:54,230 Maybe it makes it much easier. There's. 438 00:45:54,230 --> 00:46:01,820 That would have hit in the middle there. So when I look at that lady, what's your name? 439 00:46:01,820 --> 00:46:10,370 Hildegarde. Right. When I look at those Goldstrike that I see, I see it looks like that my my looks. 440 00:46:10,370 --> 00:46:15,800 Is it. It looks different. Okay. It appears differently to my. 441 00:46:15,800 --> 00:46:20,010 So I would say that jacket is pink. 442 00:46:20,010 --> 00:46:23,900 Of course Mike would also say it's pink. Okay. 443 00:46:23,900 --> 00:46:28,130 The pink is different for Mike. That is for me. That's what your. 444 00:46:28,130 --> 00:46:31,710 Where are you. That's what you say. Okay. They put it thinking. 445 00:46:31,710 --> 00:46:35,730 Let's put it red. I love you. 446 00:46:35,730 --> 00:46:43,480 And I use those colours. It's not like I'm going to say. I know people like that. 447 00:46:43,480 --> 00:46:51,650 Yeah. Shall we not get into that, don't they? 448 00:46:51,650 --> 00:46:57,510 Well, let's let's make a very important distinction between epistemology and metaphysics here. 449 00:46:57,510 --> 00:47:01,310 There's one question, which is, is something a fact? 450 00:47:01,310 --> 00:47:09,910 And there's another question. Do we know it's a fact? Okay, so let's talk about it is pink as a fact. 451 00:47:09,910 --> 00:47:14,840 OK. Rather than do we know it's a fact? 452 00:47:14,840 --> 00:47:19,460 Vic and Stein showed us. There's actually the question. Could we see it differently? 453 00:47:19,460 --> 00:47:28,550 Is actually a normal question. The answer is if they're discussing too complicated, it's going to take us too far away from. 454 00:47:28,550 --> 00:47:35,000 I'm sorry. I don't want to be using this, but I've just realised what I was about. 455 00:47:35,000 --> 00:47:45,100 I think I mean, I believe to have to be a belief. 456 00:47:45,100 --> 00:47:49,670 I'll just leave that to happen where they're going. 457 00:47:49,670 --> 00:47:57,380 Hang on. Hang on. Hang on. Oh, right. Okay. You're using beliefs in a word in a way that lots of people do. 458 00:47:57,380 --> 00:48:02,750 So actually, I'm very glad you brought this up. People think of beliefs as things that you can't prove. 459 00:48:02,750 --> 00:48:08,480 So you have either before you have knowledge. Well, that's not how we use the word belief in philosophy. 460 00:48:08,480 --> 00:48:21,350 A belief is something you postulate an explanation of someone's behaviour or is something you put forward as true or as false. 461 00:48:21,350 --> 00:48:26,360 And it's certainly not the case that it's something you can't prove. I mean, there are many beliefs that we can prove. 462 00:48:26,360 --> 00:48:31,260 I mean. Just, sir, his. 463 00:48:31,260 --> 00:48:40,080 I believe that two plus two is four. And I daresay that you wouldn't want me to even attempt to prove that because you believe it, too. 464 00:48:40,080 --> 00:48:46,630 Is that reasonable? OK, so here's a belief that we can. 465 00:48:46,630 --> 00:48:50,610 That we believe is conclusive. True, so. 466 00:48:50,610 --> 00:48:56,390 So we do what we believed to be religious belief or something like that. 467 00:48:56,390 --> 00:49:07,800 Look, this is positive. If we go back to this, let's use chair concepts of chair and chair. 468 00:49:07,800 --> 00:49:13,670 Yes, sir. The chair is something I can draw. 469 00:49:13,670 --> 00:49:19,810 OK. I can't draw the concept of a chair. I can only entertain it. 470 00:49:19,810 --> 00:49:27,440 And I can say chair has five letters. See what I mean? 471 00:49:27,440 --> 00:49:34,630 OK. Chains exist. Now, that's a fact which I didn't think about. 472 00:49:34,630 --> 00:49:38,940 Do chairs exist? Barclays said the chairs didn't exist. 473 00:49:38,940 --> 00:49:46,440 Accepters perception's in my mind. And of course, I can then talk about what I'm thinking about. 474 00:49:46,440 --> 00:49:56,710 So the fact that chairs exist. If indeed it is a fact is something we can think about and talk about. 475 00:49:56,710 --> 00:50:05,430 Do you do you see the distinction? You may not feel confident in using it at the moment, but that's just a matter of practise. 476 00:50:05,430 --> 00:50:08,450 It's if we confuse these three levels, 477 00:50:08,450 --> 00:50:16,730 we will not think clearly because you might end up thinking like a concept chair has five letters or concepts that have any lessons, 478 00:50:16,730 --> 00:50:21,250 actually, or you might think. Chairs have five letters which she chairs. 479 00:50:21,250 --> 00:50:25,640 Don't want any lessons. Doesn't make sense. The thing my chairs chairs having mean. 480 00:50:25,640 --> 00:50:32,450 See what I mean. Keep these. So going back to this one. 481 00:50:32,450 --> 00:50:39,380 If I said this junk is loud. 482 00:50:39,380 --> 00:50:48,830 What would you think? This jug is loud. I would wonder if you're in a different context. 483 00:50:48,830 --> 00:50:54,630 Well, I need to be perfectly reasonable for you to be to think that's because actually that doesn't make any sense. 484 00:50:54,630 --> 00:50:59,790 That sentence does it, because Juggs of the sort of thing that can be loud. 485 00:50:59,790 --> 00:51:06,410 Okay. But it's just not. It would have to be metaphorical. I'd have to be being poetic or something like that or I would just not. 486 00:51:06,410 --> 00:51:12,530 I would be displaying my misunderstandings were laddered or the misunderstanding of the word job. 487 00:51:12,530 --> 00:51:21,830 Is that right? When you say that argument is false, you display the fact that you don't understand either. 488 00:51:21,830 --> 00:51:31,370 The words are the arguments or false. There's arguments can't be true or false. 489 00:51:31,370 --> 00:51:35,750 Arguments can only be good or bad. They can be valid or invalid. 490 00:51:35,750 --> 00:51:43,760 They can't be true or false. And that's because it's the only things that are true or false or beliefs or sentences. 491 00:51:43,760 --> 00:51:54,380 The sentences thus express beliefs. Now, in general, everyday talk, we do talk about arguments being true or false. 492 00:51:54,380 --> 00:52:02,180 You know, everybody does that. But if you want to learn how to reason, if you want to learn how to think clearly about arguments, 493 00:52:02,180 --> 00:52:06,380 you must stop doing that because arguments can't be false. 494 00:52:06,380 --> 00:52:14,320 What is it for a belief to be false? If I if I told her what if I quote Mike is tall. 495 00:52:14,320 --> 00:52:26,780 OK. What is it for that belief to be false? Now the it's for the things that I mean by Mike to not be in the in the class of things that at all. 496 00:52:26,780 --> 00:52:31,040 Is that right? And all occupants are six of sentences. 497 00:52:31,040 --> 00:52:44,930 You can't evaluate them in that way. Can you turn, though, that there's a form of argument that is the truth, preserving all arguments, 498 00:52:44,930 --> 00:52:53,900 truth preserving or these all good arguments and truth preserving because the truth of the premises is preserved in the truth of the conclusion. 499 00:52:53,900 --> 00:52:59,680 So it's silly to say that's not true. And we'll talk about that later on in science. 500 00:52:59,680 --> 00:53:04,270 But we're not saying it's true. We say it's truth. Preserving knowledge is a different thing entirely. 501 00:53:04,270 --> 00:53:08,840 Yeah. OK. Do we understand this? 502 00:53:08,840 --> 00:53:21,410 This is crucially important because to understand what truth is, is to see that if it's predicated only of sentences and beliefs, 503 00:53:21,410 --> 00:53:30,590 not of arguments, and to understand what an argument is, is to see that it can't be true or false. 504 00:53:30,590 --> 00:53:36,430 I think you can see that with the argument about the wording, which is. 505 00:53:36,430 --> 00:53:42,060 You can see what that it can't be. It was a valid argument. 506 00:53:42,060 --> 00:53:48,750 Right. That differentiated from truth. 507 00:53:48,750 --> 00:53:53,970 The truth is only contained in that argument. 508 00:53:53,970 --> 00:54:02,040 Nobody would say that, which is better than what you saw in terms of the way the argument is constructed. 509 00:54:02,040 --> 00:54:13,350 The reasoning was valid. Yup. I'm not sure how to unpack what you're saying here, except to say that that's actually. 510 00:54:13,350 --> 00:54:17,190 Oh, yes. Not me. That was an argument. 511 00:54:17,190 --> 00:54:25,170 It's not argument because we're saying that that is true and we're offering his reasons for believing it's truth. 512 00:54:25,170 --> 00:54:30,800 The truth of that and the truth of that. 513 00:54:30,800 --> 00:54:35,650 OK. So the argument itself is a good one. 514 00:54:35,650 --> 00:54:39,730 And you use the word valid to we'll get on to about valid at some point next week, I think. 515 00:54:39,730 --> 00:54:44,640 But so that's that's the argument itself. 516 00:54:44,640 --> 00:54:54,710 Can't be true or false. But the sentences that constitute the arguments can, of course, be either true or false. 517 00:54:54,710 --> 00:54:59,820 So if. Does it make up? 518 00:54:59,820 --> 00:55:06,840 Well, that's very important and we'll come to that later. So, as that sounds, is actually contained three assertions. 519 00:55:06,840 --> 00:55:10,860 It contains three sentences, each of which could be used as an assertion. 520 00:55:10,860 --> 00:55:16,590 And in order for a sentence severe recession, it's got to be asserted. And I'm not really asserting this. 521 00:55:16,590 --> 00:55:26,530 I'm just talking about it. But yes, so we have three potential assertions, each of which is either true or false. 522 00:55:26,530 --> 00:55:34,380 And together they make up the arguments because two are being offered as reasons for believing the truth of the other. 523 00:55:34,380 --> 00:55:37,900 Right. OK. A good argument. This is coming on to your point. 524 00:55:37,900 --> 00:55:45,600 Now, add to that a good argument must have at least two characteristics. 525 00:55:45,600 --> 00:55:50,520 Actually, it needs many more than two characteristics. But there are two that we're really interested in. 526 00:55:50,520 --> 00:55:54,840 These are the two. The conclusion was follow from the premises. 527 00:55:54,840 --> 00:55:59,130 Okay. And the premises must all be true. Okay. 528 00:55:59,130 --> 00:56:05,040 If both those things are true, you've got a good argument. 529 00:56:05,040 --> 00:56:11,790 If one of these things if the conclusion doesn't follow, then even if the premises are true, 530 00:56:11,790 --> 00:56:17,880 you haven't got a convincing argument or if the premise is not true. 531 00:56:17,880 --> 00:56:28,020 And even though the conclusion follows that you haven't got a good argument in that way because the premise is false. 532 00:56:28,020 --> 00:56:35,400 But having said that, we're interested only in argument in this session. 533 00:56:35,400 --> 00:56:38,910 We're not actually interested in the truth of the premises at all. 534 00:56:38,910 --> 00:56:47,040 We're interested only in the whether the arguments follow from sorry, one conclusion follows from the premises. 535 00:56:47,040 --> 00:56:54,660 So as logicians, generally, we're not in the business of going out to the world to see where the premises are, true or false. 536 00:56:54,660 --> 00:56:58,680 We're only in the business of seeing whether the relation between the premises and 537 00:56:58,680 --> 00:57:04,170 the conclusion is such that the are the conclusion follows from the premises. 538 00:57:04,170 --> 00:57:10,580 And as we'll see next week, there are loads of different ways in which conclusions can follow from premises. 539 00:57:10,580 --> 00:57:18,420 But so I, I would often talk about an arguments being good, even though the premises. 540 00:57:18,420 --> 00:57:22,390 I mean, let's take this one. Okay. 541 00:57:22,390 --> 00:57:28,650 That's a good argument or not. Yeah. Yeah, it's good in the logicians sense isn't it. 542 00:57:28,650 --> 00:57:32,110 I mean actually the premises are all false aren't they. 543 00:57:32,110 --> 00:57:36,690 They're both false. There are only two premises of this argument that they are false. It's not Friday. 544 00:57:36,690 --> 00:57:41,980 It's Monday. And Marijan always wears jeans on Fridays also false. 545 00:57:41,980 --> 00:57:47,130 No, let's take it from me. So that's not a good argument from the point of view of the premises. 546 00:57:47,130 --> 00:57:53,340 But as far as the magician is concerned, that is a good argument because the conclusion follows from the premises. 547 00:57:53,340 --> 00:58:00,120 Okay. So if we were actually using that argument to say anything, we'd want the premises to be true as well. 548 00:58:00,120 --> 00:58:07,590 But as we're just talking about the arguments in order to say what's a good argument, what isn't a good argument, that will do. 549 00:58:07,590 --> 00:58:14,820 If that's a state, that's a conclusive argument, isn't it? If the premises are true there, the conclusion would have to be true. 550 00:58:14,820 --> 00:58:24,800 So it's a very good argument. So let's the premises. 551 00:58:24,800 --> 00:58:29,790 No, because if the premises is true here, the conclusion would have to be true, wouldn't it? 552 00:58:29,790 --> 00:58:35,720 Well, which is something. Well, but not Matthew died for a variety. 553 00:58:35,720 --> 00:58:43,500 Well, then it wouldn't be true that mine was were students or I would say my name always wore jeans on the Friday. 554 00:58:43,500 --> 00:58:50,430 Maybe. OK. What do you mean? 555 00:58:50,430 --> 00:59:00,740 I don't I'm not sure. Did people wear jeans at all? What is true is that the facts apprentice's true. 556 00:59:00,740 --> 00:59:04,400 If if there's actually urofsky a huge philosophical question there. 557 00:59:04,400 --> 00:59:08,480 But let me just say yes, because that's what makes a sentence true. 558 00:59:08,480 --> 00:59:12,300 Then it's true. Oh, company. 559 00:59:12,300 --> 00:59:17,070 I said that. That's awful. But then why do you get sick? 560 00:59:17,070 --> 00:59:25,940 You always say that you always wear jeans on Friday because know. 561 00:59:25,940 --> 00:59:36,240 Well, I hope I find Friday's employer right. Oh, I'm sorry. 562 00:59:36,240 --> 00:59:41,130 This is your high profile I think we're going to be looking at next week, 563 00:59:41,130 --> 00:59:46,140 which is the inductive arguments that inductive arguments always take us further 564 00:59:46,140 --> 00:59:51,240 than we can actually go by claiming something like swans are always white. 565 00:59:51,240 --> 00:59:59,970 Marijan always wears jeans on Friday. But but you can still say that's true. 566 00:59:59,970 --> 01:00:07,150 We are not going to get into knowledge. The philosophy is definitely not on this curriculum. 567 01:00:07,150 --> 01:00:15,830 Okay, going back to what I was saying this. 568 01:00:15,830 --> 01:00:24,750 OK, so you understand the difference between the truth of the premise and the conclusions following from the the premises, 569 01:00:24,750 --> 01:00:32,700 that that's the important thing. And it's because what makes an argument good is that the conclusion follows from the premises 570 01:00:32,700 --> 01:00:38,610 that you've got to distinguish the goodness of an argument from the truth of the premises. 571 01:00:38,610 --> 01:00:46,320 Truth, just because truth is a good thing and validity says is a good thing, doesn't make them the same thing. 572 01:00:46,320 --> 01:00:51,460 That's the important thing. We mustn't just take validity as a sort of general proof word. 573 01:00:51,460 --> 01:00:56,300 And in the same way, truth isn't just a general pro word. 574 01:00:56,300 --> 01:01:00,510 OK. Let's have a look at these arguments. Okay. One of them is good. One of them is bad. 575 01:01:00,510 --> 01:01:20,570 Don't call out, but just have a look at them yourselves and decide which is the good one and which is the bad one. 576 01:01:20,570 --> 01:01:37,680 Who's decided? All right, but we'll time. 577 01:01:37,680 --> 01:01:44,200 OK. Who's decided, OK, that's a good argument. 578 01:01:44,200 --> 01:01:48,240 Yes. Yes, that's a good argument. Well done. Yes. 579 01:01:48,240 --> 01:01:53,940 Absolutely. See, that needs come to this class. No, you're absolutely right. 580 01:01:53,940 --> 01:02:00,210 This is a deductive argument. It gives us absolute certainty in the following sense. 581 01:02:00,210 --> 01:02:06,750 If these premises and I'll read out the premises, if it's Monday, the lecture will finish at three thirty. 582 01:02:06,750 --> 01:02:11,100 It is Monday. Therefore, the lecture will finish at three thirty. 583 01:02:11,100 --> 01:02:17,350 If these premises are both true, this conclusion would have to be true, wouldn't it? 584 01:02:17,350 --> 01:02:21,660 It couldn't be false. If those two premises are both true. 585 01:02:21,660 --> 01:02:31,680 So the truth of the premises is preserved in the truth of the conclusion that you couldn't have those two premises. 586 01:02:31,680 --> 01:02:40,430 True, that conclusion not. So if you believe those two premises, rationally speaking, you must believe that conclusion. 587 01:02:40,430 --> 01:02:48,780 Okay. That's what it is to be a rational animal. And if instead I say you're wasting your time from these lectures, if you knew that, 588 01:02:48,780 --> 01:02:54,480 of course, that's nonsense because you're all rational animals, you have to be rational on it. 589 01:02:54,480 --> 01:03:00,780 You wouldn't be there if you were because you sold off the leaflets or whatever you saw and you thought, that sounds interesting. 590 01:03:00,780 --> 01:03:04,300 I would like to go to that lecture. That lecture starts at two o'clock on Monday. 591 01:03:04,300 --> 01:03:09,150 What other day? This is the moment. Therefore, I will go to that lecture hall. 592 01:03:09,150 --> 01:03:14,890 Did you not? You had loads of reasons. So we're talking theoretical arguments here. 593 01:03:14,890 --> 01:03:19,110 But, of course, actually arguments the most practive practical thing in the world. 594 01:03:19,110 --> 01:03:26,400 Your piece of practical reasoning led you here. So each one of you is rational. 595 01:03:26,400 --> 01:03:34,020 What we're doing in these lectures is learning how to explicate our capacity for reason. 596 01:03:34,020 --> 01:03:38,970 Okay. You know, whether confusion follows from premises or not. 597 01:03:38,970 --> 01:03:44,370 You ask why when you argue in the past with your sons, daughters, wives or whomever, you know, 598 01:03:44,370 --> 01:03:50,070 whether you've what you're hearing is a good argument or not, you can there's something wrong with that argument. 599 01:03:50,070 --> 01:03:55,590 You say, as you read the leader in the newspapers, you hear the person on television or something like that, 600 01:03:55,590 --> 01:04:02,180 something that's out of your intuitions or your rational intuitions and telling you what you need to know. 601 01:04:02,180 --> 01:04:10,900 But what you're doing in these classes is learning how to make explicit your intuitions, what what your intuitions are telling you. 602 01:04:10,900 --> 01:04:14,340 OK. So your intuition is telling quite categorically that that's a good idea. 603 01:04:14,340 --> 01:04:25,200 That's about all. What's wrong with this one? That's just proof that the science ordinary guy is guilty. 604 01:04:25,200 --> 01:04:28,980 Yes. Okay. Everything I heard there is is is good. 605 01:04:28,980 --> 01:04:35,700 The fact is that. OK. Let me ask you a question. Could it be the case that these two premises are true? 606 01:04:35,700 --> 01:04:39,520 And yet this conclusion falls. OK. 607 01:04:39,520 --> 01:04:47,490 Can anyone give me a counterexample to this argument? Let me read them out again for the people who can't hear. 608 01:04:47,490 --> 01:04:53,550 If it's Monday, the lecture will finish at three thirty. The lecture will finish at three thirty. 609 01:04:53,550 --> 01:05:00,450 Therefore, it's Monday. OK. Can anyone give me a counterexample to that argument? 610 01:05:00,450 --> 01:05:07,110 A situation in which both those premises are true and that conclusion is false. 611 01:05:07,110 --> 01:05:13,600 A situation in which both those promises are true and that confusion is false. 612 01:05:13,600 --> 01:05:18,090 On Tuesday, Minutemen's three. Good. Well done all. 613 01:05:18,090 --> 01:05:23,340 Wednesday. Thursday, Friday. Exactly. This says, If it's Monday, intellectual finish at three thirty. 614 01:05:23,340 --> 01:05:30,810 This merely says the lecture will finish at three thirty. It could be Monday, but it might not be OK. 615 01:05:30,810 --> 01:05:35,790 So there is a situation in which both these premises are true and this conclusion is false. 616 01:05:35,790 --> 01:05:39,240 Therefore, this is a bad argument. It's an invalid argument. 617 01:05:39,240 --> 01:05:45,020 It's actually an instance of the fallacy of affirming the consequent figures. 618 01:05:45,020 --> 01:05:51,810 You see that the acts that led to the lectures, the arguments about whether they are they look very similar, but of course they're not. 619 01:05:51,810 --> 01:05:59,530 Because this one's taken the antecedent as the second premise and this one's taken with consequence. 620 01:05:59,530 --> 01:06:05,580 That's the second premise. And we'll be learning a lot more about fallacies later on in the course. 621 01:06:05,580 --> 01:06:08,130 But that's it for today. 622 01:06:08,130 --> 01:06:16,740 Next week, we're going to look at the all the different sorts of argument they the arguments that all and how to distinguish them from each other. 623 01:06:16,740 --> 01:06:22,000 And then we're going to get on to learning how to set them out properly and how to evaluate them. 624 01:06:22,000 --> 01:06:32,550 OK, we've got courtroom now for four questions. If you haven't got a car bath. 625 01:06:32,550 --> 01:06:39,190 No. That's easy. You can try three Heysel Hazels. 626 01:06:39,190 --> 01:06:45,160 He might be funny, but I doubt it. Who is this bathroom of. 627 01:06:45,160 --> 01:06:54,660 And towers in the. And what does he say? He didn't think a chair was only a concept. 628 01:06:54,660 --> 01:06:58,860 It was Bishop Barclay. George Barclay who lived. 629 01:06:58,860 --> 01:07:10,290 I don't know where he lived. I'm sorry I didn't remember dates. He believes that our only reason for believing that something exists is because 630 01:07:10,290 --> 01:07:18,630 we can either see it now or that we could see it under some other circumstances. 631 01:07:18,630 --> 01:07:23,340 So if I claim. Okay. 632 01:07:23,340 --> 01:07:28,220 What makes it true that this left turn exists so we can sit here? 633 01:07:28,220 --> 01:07:37,470 It. We can touch it. All sorts of things. What's more, we also believe that were we to come back tonight at midnight. 634 01:07:37,470 --> 01:07:42,200 Nobody had moved us and saw. No all other things being equal. It would still be here. 635 01:07:42,200 --> 01:07:47,040 OK. So there we have an appeal to actual perceptions. 636 01:07:47,040 --> 01:07:53,670 Okay. We can see it now. And we've got an appeal to counter factual perceptions. 637 01:07:53,670 --> 01:07:57,750 If we came at 12 o'clock, we would be able to see it. 638 01:07:57,750 --> 01:08:08,670 And Barclay says, you give me a reason for thinking that anything exists that doesn't depend upon actual or counterfactual perceptions. 639 01:08:08,670 --> 01:08:10,650 Sorry. Well, let me rephrase that. 640 01:08:10,650 --> 01:08:17,760 You will not be able to give me a reason to think that anything exists that doesn't appeal to one or other of those two. 641 01:08:17,760 --> 01:08:27,860 Therefore, if you if something is unconceivable, then you have no reason to be desists. 642 01:08:27,860 --> 01:08:32,370 Concept what we experience concepts all the time. 643 01:08:32,370 --> 01:08:40,700 Do we exist? Wouldn't be think of a concept is a constituency for thought. 644 01:08:40,700 --> 01:08:49,990 So as long as you think you think, then we will think in concepts and we have reason for thinking concepts exist. 645 01:08:49,990 --> 01:08:56,940 Sorry, is that the same sort of thing as furphy collapsing in the middle of some forest somewhere? 646 01:08:56,940 --> 01:09:02,170 No. Yes. I mean, the fact is, if you were in the forest, you would hear it. 647 01:09:02,170 --> 01:09:08,710 Yes, you might lose is. In other words, you're happy that it would make a noise. 648 01:09:08,710 --> 01:09:16,990 No, for. I mean, your reason for thinking that noise exists is that you would hear it if you were there. 649 01:09:16,990 --> 01:09:22,780 So that's a counterfactual perception that you were basing that on. 650 01:09:22,780 --> 01:09:26,650 What Berkeley is very simple and he's a fascinating philosopher, actually. 651 01:09:26,650 --> 01:09:33,370 He thinks that physical objects are made up of ideas of ours. 652 01:09:33,370 --> 01:09:40,750 This is one of the first idealists. And he doesn't mean that you can put your hand through this because it's an idea. 653 01:09:40,750 --> 01:09:46,540 He just means that my idea of this lectern is an idea made up of part of solidity. 654 01:09:46,540 --> 01:09:53,590 The idea that if I do that, I won't be able to push any further. That's a perception notice. 655 01:09:53,590 --> 01:10:07,740 That's a perception. It's a bundle of perceptions. You said as well that we only have second accounts of everything because. 656 01:10:07,740 --> 01:10:15,440 What song did that sound? What we say is actually the result of a rapper. 657 01:10:15,440 --> 01:10:24,210 Rabson in the brain. Say something that's. Computer ransom, and that's translated into servers away servers are kind of like, I think I've sense data, 658 01:10:24,210 --> 01:10:34,230 perhaps so said that we never see the object directly, we just see the surface comments are from, you know, some play on screen. 659 01:10:34,230 --> 01:10:39,510 But there are two ways to think about sets data. One way is now very old fashioned. 660 01:10:39,510 --> 01:10:44,850 We don't see people and that's the way the Russell victims died and people at that thought. 661 01:10:44,850 --> 01:10:49,020 Which is that we never see the thing itself. Yeah. 662 01:10:49,020 --> 01:10:53,960 We only ever see it an idea in our minds. And so why would you think that's answer? 663 01:10:53,960 --> 01:10:58,560 Because you can never be sure that. I mean, are you really sure that I'm here? 664 01:10:58,560 --> 01:11:04,300 I mean, your reasons for being for believing that I'm here is you can see me here, me and saw it. 665 01:11:04,300 --> 01:11:13,470 But couldn't it be with you? Exactly as it is now. And yes, it not to be true that I'm here and I'm for. 666 01:11:13,470 --> 01:11:17,240 When you say no. Have you never had a lucid dream with it? 667 01:11:17,240 --> 01:11:21,690 You said, I'm sorry. You said. 668 01:11:21,690 --> 01:11:30,000 I did. So you don't think that you could have an experience as if I were here doing what I'm doing and yet I'm not here. 669 01:11:30,000 --> 01:11:35,540 You'll probably have all of tonight. It's a dream. 670 01:11:35,540 --> 01:11:40,620 Jeannie would be one, but. But here's another one. I mean, what what makes it. 671 01:11:40,620 --> 01:11:47,130 What do you think at the moment is that you won't have a perception's arse off me? 672 01:11:47,130 --> 01:11:57,150 What's causing those perceptions is me. And what's more, your perceptions are a good guide to what I like. 673 01:11:57,150 --> 01:12:16,700 But look. If we talk about the causal relation, if we think that a mass cause B or sorry A causes B, we have to know about both A and B, don't we? 674 01:12:16,700 --> 01:12:21,440 We have to see that they're constantly conjoin, they're correlated, something like that. 675 01:12:21,440 --> 01:12:29,090 We can't. So we've got to be something here, if you like, to see that they can be correlated. 676 01:12:29,090 --> 01:12:38,420 But if you will think your B is a chair and A is your idea of a chair. 677 01:12:38,420 --> 01:12:45,830 And you can't get outside your ideas. And here is where you stand with respect to your perceptions, isn't it? 678 01:12:45,830 --> 01:12:51,820 How can you get outside your perceptions to see what causes them? 679 01:12:51,820 --> 01:13:01,330 You see what I mean, because you have got. In a dream, you could have a little talk about dreams. 680 01:13:01,330 --> 01:13:13,610 I want to live up to that with something as objective fact that we have existing these are called change. 681 01:13:13,610 --> 01:13:24,870 Yes. Let me ask the question again. If we're talking about your idea of a share, your ideas or the chair concepts to chair the song and the chairs, 682 01:13:24,870 --> 01:13:34,140 can you get outside your idea of a chair in order to see that it's caused by a chair? 683 01:13:34,140 --> 01:13:38,590 Now, if it can be put into me exactly as it is now, here I am. 684 01:13:38,590 --> 01:13:42,270 Look at this challenge, Commissioner, hearing the council's things. 685 01:13:42,270 --> 01:13:50,370 And yes, it's possible that I might be asleep. And that being the chair here, even if I'm asleep, I might want to say something like, 686 01:13:50,370 --> 01:13:57,060 well, I must have experienced the chair before and will to be able to do this. 687 01:13:57,060 --> 01:14:03,510 I could say, well, why should I think in the first place that there is something that's causing my perceptions? 688 01:14:03,510 --> 01:14:12,160 All I've got is my perceptions. I can't get outside my perceptions to adopt this perspective on them. 689 01:14:12,160 --> 01:14:19,240 Can I? Sir, are you saying you can create the idea of projecting your mind without actually having seen maybe not recreate them? 690 01:14:19,240 --> 01:14:25,480 It may be an evil demon. What I'm giving you is the Cartesian thought experiment. 691 01:14:25,480 --> 01:14:32,310 And the idea being that if you push what you know to the final degree, 692 01:14:32,310 --> 01:14:39,840 you'll see that actually you're the only reason you believe in the physical universe and things outside yourself, 693 01:14:39,840 --> 01:14:50,910 and that includes your own body is because you assume that your perceptions are caused by something outside yourself, outside your mind, 694 01:14:50,910 --> 01:14:58,740 and that your mind is a good guide to the nature of these things, that if you question both those perceptions, you're left with nothing. 695 01:14:58,740 --> 01:15:04,230 Because what makes you think that there's something outside causing your perceptions? 696 01:15:04,230 --> 01:15:14,410 If all you can see is the perceptions themselves, rather of the causal relation between your perceptions and whatever's causing them, 697 01:15:14,410 --> 01:15:22,000 we can see it this way in the critical reasoning. What is your reaction, control? 698 01:15:22,000 --> 01:15:28,510 What's your knowledge? I give you time to get me out of this new. 699 01:15:28,510 --> 01:15:34,600 That's nice, but all you talk about is one experience after another, aren't you? 700 01:15:34,600 --> 01:15:38,740 I mean, there are some perceptions of mine that obey my will. 701 01:15:38,740 --> 01:15:43,300 And there are other perceptions. Mine, the troops that share doesn't obey my will stop. 702 01:15:43,300 --> 01:15:48,880 That particular perception doesn't have been my will, whereas others do. 703 01:15:48,880 --> 01:15:56,910 I think that I've introduced the Cartesian thought experiment with too little time to convince you. 704 01:15:56,910 --> 01:16:01,240 I mean, you can go away and read the first meditation. It's very easy to read. 705 01:16:01,240 --> 01:16:08,650 It's actually it doesn't take much longer to read them use. 706 01:16:08,650 --> 01:16:12,430 Barclays, Barclays, I did. I mean, 707 01:16:12,430 --> 01:16:18,190 the Cartesian thought experiments completely revolutionised philosophy because it 708 01:16:18,190 --> 01:16:24,190 breathalysed revolutionised all belief that we could claim to have knowledge. 709 01:16:24,190 --> 01:16:36,790 Barclay attempted to get over that because if we. OK, here's the world and here's our minds. 710 01:16:36,790 --> 01:16:46,410 And here's the evil demon. Hey, Day Decors has shown the once this is in place and you see that could be exactly as it is. 711 01:16:46,410 --> 01:16:52,230 Whatever this is like, you need to say something about our knowledge of the external world. 712 01:16:52,230 --> 01:16:59,190 And what Barclays' doing is he's remaking the world in the mind. 713 01:16:59,190 --> 01:17:09,360 So if there is nothing more to a physical object than a set of perceptions and this the only thing of which we can have knowledge is our perceptions, 714 01:17:09,360 --> 01:17:15,840 then there's no reason why we can't have knowledge of physical objects if they are perceptions. 715 01:17:15,840 --> 01:17:24,300 So Barclay was trying to show that we do have knowledge despite the Cartesian thought experiment anyway. 716 01:17:24,300 --> 01:17:28,620 There is no way we can would like to know more about the past. 717 01:17:28,620 --> 01:17:32,260 Come to another set of lectures. 718 01:17:32,260 --> 01:17:48,060 I see there is time for one more question, if anyone would like to read this one, but this lady has told us people, some media. 719 01:17:48,060 --> 01:17:55,710 No. What do you know what they're doing? 720 01:17:55,710 --> 01:17:58,200 Well, they're all goods on the bill. They wouldn't be on the reading list. 721 01:17:58,200 --> 01:18:03,870 The short introduction to logic is very interesting, and that's very easy to read. 722 01:18:03,870 --> 01:18:12,940 Very short. So I'll have to get the ethics book by is only short. 723 01:18:12,940 --> 01:18:17,260 And the leaflets. The ones I never read. 724 01:18:17,260 --> 01:18:26,280 OK, well, if you look outside, they'll find you'll find the leaflets a little thing and you should find reading is not just in the book. 725 01:18:26,280 --> 01:18:29,630 OK, sorry. 726 01:18:29,630 --> 01:18:34,510 Sounds good there. Yes I know it sounds pretty, it's very irritating. 727 01:18:34,510 --> 01:18:40,440 It you can get to talk and listen to what you get out there. 728 01:18:40,440 --> 01:18:57,350 It's, it's the reason it's irritating is it's a very different form. If you can't find Salaam's and let me know I can try. 729 01:18:57,350 --> 01:19:02,590 I can't lose by that, sorry. It's all the reason. OK. 730 01:19:02,590 --> 01:19:09,688 I think we'll stop that. Thank you. Coming. See you next week.