Introduction to Logic. Instructor: Jason Sheley
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1 Introduction to Logic Instructor: Jason Sheley
2 Opening week Welcome to the class! My first goal this week is to show you what the class is all about so that you can make an informed decision as to whether you want to take it or not. My second goal is to help ease us into studying logic so that it seems not so intimidating.
3 On What Logic is Getting Over the Fear of Logic The Plan for the semester
4 What is logic? Who cares? Why should we study it? What do you think?
5 What s the correct approach? I think it s this: We care about logic because we have questions we want to answer. Logic helps us do this
6 My favorite definition Logic is the art of moving from what we know to what we don t know (or, from what is established to what would like to establish.) (This idea is credited to the philosopher C.S. Pierce, although I can t seem to find the exact quotation.)
7 The Star of the Show
8
9
10 Logic has two dimensions: Courageous we want to build new ideas, prove new things, make new discoveries Cautious we want to make sure that our new idea really works, that the proof is successful, that we really have made a discovery
11 As I mentioned last time, (in a sense) we already know how to do this. Let s look at some examples...
12 (In a parking lot...) 1) You can either go right or go left. 2) The path to the right is blocked. Therefore,.
13 1) All Snakes should be killed 2) Socrates is a snake Therefore, (?)
14 Let s go back to the syllabus and look at the topics we will cover...
15 Puzzle The Ship of Theseus...
16 Let's apply the structure...
17 The question: what does the identity of an object consist in? The answer(s):??? Reasons:... Critique?
18 Another version...
19
20 What does it mean to think critically? What role does logic play in criticism?
21 Puzzle: Can a monkey take a selfie?
22 There are a couple lessons we can take from this: 1) Learning logic isn t enough 2) We need to develop good habits in addition to learning the rules
23 Arguments, premises, and conclusions
24 Logic and arguments Logic: the organized body of knowledge, or science, that evaluates arguments. Argument: A group of statements, one or more of which (the premises) are claimed to provide support for, or reasons to believe, one of the others (the conclusion)
25 Logic and arguments Premises: Premise 1, Premise 2, Premise 3... Claimed evidence Conclusion What is claimed to follow from the evidence
26 statements The premises and the conclusion must be in the form of statements. But what is a statement? A statement is something that is either true or false. 1. Broccoli is a good source of vitamin A. 2. Argentina is located in North America. 3. Rembrandt was a painter and Shelley was a poet.
27 Not Statements 1. What is the atomic weight of carbon? 2. Let s go to the park today. 3. We suggest that you travel by bus. 4. Turn to the left at the next corner. 5. All right! Why aren t these statements?
28 Not Statements 1. What is the atomic weight of carbon? (question) 2. Let s go to the park today. (suggestion) 3. We suggest that you travel by bus. (suggestion) 4. Turn to the left at the next corner. (command) 5. All right! (exclamation) Why aren t these statements?
29 more on statements All statements have truth-values. Truth and falsity are called the two possible truthvalues of a statement. Only statements can have truth-values. Note: Arguments do not have truth-values.
30 Premises and conclusions How can we tell the difference All film stars are celebrities. Halle Berry is a film star. between a premise and a conclusion? Therefore, Halle Berry is a celebrity.
31 Conclusion indicators Therefore.. Thus... Conseque ntly... We may infer... Accordingl y... We may conclude... It must be that... For this reason... So... This entails that... Hence... It follows that... This implies that... As a result... Ergo... QED
32 Examples conclusion of indicators Tortured prisoners will say anything just to relieve the pain. Consequently, torture is not a reliable method of interrogation. An agreement cannot bind unless both parties to the agreement know what they are doing and freely choose to do it. This implies that the seller who intends to enter a contract with a customer has a duty to disclose exactly what the customer is buying and what the terms of the sale are.
33 Premise indicators Since... As indicated by... Because... For... In that... May be inferred from... As... Given that... Seeing that... For the reason that... Owing to... Is evidenced by...
34 Example of a Premise Expectant indicator mothers should never use recreational The use of recreational drugs can jeopardize the development of the fetus. drugs, since the use of these drugs can jeopardize the development of the fetus. Expectant mothers should never use recreational drugs.
35 Example of a Premise indicator The fact that there was never a land bridge between Australia and mainland Asia is evidenced by the fact that the animal species in the two areas are very different. Asian placental mammals and Australian marsupial mammals have not been in contact in the last several million years. The animal species in Australia and Asia are very different. Asian placental mammals and Australian marsupial mammals have not been in contact in the last several million years. There was never a land bridge between Australia and mainland Asia.
36 Examples: Argument or No Argument? On January 26, asteroid 2004 BL86 safely flew right past us, making its closest approach around 11:19 a.m. EST at a distance of about 1.2 million kilometers -- that s only about three times the distance between us and our moon. And it turns out, the asteroid has its own little moon. Nine cases of measles have so far been recorded in an outbreak in California and Utah, and the number is expected to rise. It is thought that many of the infections were transmitted at Disneyland. Predictably, most of those who have become sick were not vaccinated. Infuriatingly, two of them were children who were too young to get the measles shots, rather than being the children of vaccine opponents. Unlike Ebola, measles is highly contagious. When its airborne, a single person can potentially infect many others by coughing or sneezing, particularly if they spend a day in a crowded place like Disneyland. If you spend long enough with someone who has measles and you either have not had it before or been vaccinated, you have a 90% chance of coming down with the disease. - (Source: iflscience.com)
37 Argument or No Argument?
38 Arguments without indicators What single statement is claimed to follow from the others? What is the arguer trying to prove? What is the main point of the passage? Use these questions to try and find the conclusion.
39 Opening puzzle: The Experience Machine
40 Would you plug into the machine? Why or why not?
41
42 Let's talk about essays
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