Introduction to Philosophy
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1 Introduction to Philosophy Philosophy 110W Russell Marcus Hamilton College, Fall 2013 Class 1 - Introduction to Introduction to Philosophy My name is Russell. My office is 202 College Hill Road, Room 210. My office phone is My office hours are 11am - noon daily. Marcus, Introduction to Philosophy, Slide 1
2 Camp Hamilton is over. Welcome to College. Marcus, Introduction to Philosophy, Slide 2
3 Five Topics in This Course P Appearance and Reality P Space and Time P Personal Identity P Consciousness and the Nature of Mind P Ethics Marcus, Introduction to Philosophy, Slide 3
4 Metaphysics P What is there? P What is it like? P Some things that one might think exist Trees Tables Planets and Stars People Electrons Angels Numbers Space-time points Marcus, Introduction to Philosophy, Slide 4
5 Properties P Red P Square P Moving at 25 miles an hour P Located outside of space and time P Being considered by you right now Marcus, Introduction to Philosophy, Slide 5
6 Properties P Red P Square P Moving at 25 miles an hour P Located outside of space and time P Being considered by you right now Marcus, Introduction to Philosophy, Slide 6
7 Nominalism a name may not refer to anything real P Nominalism opposes realism. P Santa Claus P Properties: Is there redness, in addition to red things? P Where should the line between nominalism and realism be drawn? Marcus, Introduction to Philosophy, Slide 7
8 Reality Is the world exactly as it appears? Marcus, Introduction to Philosophy, Slide 8
9 Julian Beever, Anamorphic Art Marcus, Introduction to Philosophy, Slide 9
10 More Anamorphic Art Marcus, Introduction to Philosophy, Slide 10
11 Hans Holbein The Ambassadors (1533) Marcus, Introduction to Philosophy, Slide 11
12 Marcus, Introduction to Philosophy, Slide 12
13 Epistemology theory of knowledge P How do we know what we know? P Does all our knowledge originate in sense experience, or are there other ways of gaining knowledge? P How can we explain our predictive success in science, when we seem to be isolated from the laws of nature? Marcus, Introduction to Philosophy, Slide 13
14 Logic The Primary Tool of Philosophy P An argument is set of assertions, called premises, that support a conclusion. P The premises and conclusion should be truth valuable, i.e. capable of being either true or false. P In a valid deductive argument, if the premises are true, the conclusion must be true. P The validity of an argument depends on the form of the argument. Marcus, Introduction to Philosophy, Slide 14
15 An Argument Premise 1. All persons are mortal. Premise 2. Socrates is a person. Conclusion: Socrates is mortal. More abstractly: 1. All As are Bs 2. x is an A. So, x is a B. Marcus, Introduction to Philosophy, Slide 15
16 Another Valid Form 1. Either the Giants or the 49ers will win the NFC. 2. The Giants will not win. So, the 49ers will win. This Disjunctive Syllogism can be represented more abstractly as: 1. A or B. 2. Not-A. So, B. Marcus, Introduction to Philosophy, Slide 16
17 The Importance of Validity 1. All men are fish 2. Joe is a man. So, Joe is a fish. P If the conclusion of a valid deductive argument is false, at least one of the premises must be false. P The conclusion of the argument is false. P So we have to reject one of the premises. P An argument is unsound when at least one of its premises is false. Marcus, Introduction to Philosophy, Slide 17
18 Soundness and Validity P Validity concerns form of argument. P Validity is about whether some assertion follows from some other assertions. P A valid argument is sound if its premises are true. P The first step in evaluating an argument is to determine whether the premises entail the conclusion. P The second step is to see if the premises are sound (i.e. true). Marcus, Introduction to Philosophy, Slide 18
19 Invalid Argument Forms P Invalid forms are called fallacies, or logical errors. P In an invalid argument, the conclusion can be false, while the premises are true. P Two examples: The fallacy of denying the antecedent: 1. If A then B. 2. Not-A. So, not-b. The fallacy of affirming the consequent: 1. If A then B. 2. B. So, A. Marcus, Introduction to Philosophy, Slide 19
20 Underlying Structure Most philosophers do not write in argument form. Marcus, Introduction to Philosophy, Slide 20
21 Reductio Arguments P Based on the logical principle called non-contradiction P A statement can not be both true and false. P The form of a reductio argument 1. Assume the negation of something. 2. Derive a contradiction (p and not-p), or other repugnant conclusion. 3. Conclude the affirmative of your assumption. Marcus, Introduction to Philosophy, Slide 21
22 Examples of Reductio Arguments P If everyone may do as (s)he pleases, then murder is acceptable. P If we legalize drugs, then violent crime will increase or productivity will decrease. P If we do not go to war in Iraq, then Saddam Hussein will use his weapons of mass destruction against us. Marcus, Introduction to Philosophy, Slide 22
23 Contrast Two Arguments Example A: 1. Any disease which threatens many lives is worth our concern. 2. Mumps is worth our concern. So, mumps threatens many lives. Example B: 1. If AIDS were harmless then we would not need to take precaution against it. 2. AIDS is harmless. So, we need not take precautions against AIDS. A and B are both bad arguments, but for different reasons. A is invalid, we do not have to go to the second step. B is valid, passes the first test. B is unsound - one of the premises is false. Marcus, Introduction to Philosophy, Slide 23
24 Consider 1. God is love. 2. Love is blind. 3. Ray Charles is blind. So, Ray Charles is God. Marcus, Introduction to Philosophy, Slide 24
25 Consider This sentence is false. Marcus, Introduction to Philosophy, Slide 25
26 Another Tool: Intuitions P Not a spooky sixth sense P The way that things seem P Thought experiments What if there were two suns? What if I were of the opposite gender? What if my parents never met? What if machines could think? What if no one had eyes? Marcus, Introduction to Philosophy, Slide 26
27 Counterfactuals P The notion of validity relies on counterfactual reasoning. P It concerns possibility and necessity. An argument is valid if the conclusion follows necessarily from the premises. An argument is invalid if it is possible for the conclusion to be false while the premises are true. P We will use our intuitions about counterfactual circumstances. P Science fiction Marcus, Introduction to Philosophy, Slide 27
28 The Syllabus P Writing Intensive P Course Website Papers (links) Reading Guides Lecture Notes P Précis P Four Papers P Presentation P Final P Schedule Movies! Marcus, Introduction to Philosophy, Slide 28
29 The Country of the Blind Marcus, Introduction to Philosophy, Slide 29
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