exercise21answers

exercise21answers - Exercise 21 Answers Philosophy 102...

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Exercise 21 Answers Philosophy 102 (Maher) Spring 2009 1. (a) ( S D ) · ( I ⊃ ∼ D ) D ∨ ∼ D S ∨ ∼ I Destructive dilemma (b) ( L ⊃ ∼ A ) · ( C F ) L · ∼ C A · ∼ F Invalid form (c) ( F T ) · ( I ⊃ ∼ T ) T ∨ ∼ T F I Destructive dilemma (d) ( T G ) · ( T P ) T ∨ ∼ T G P Constructive dilemma (e) ( C ⊃ ∼ S ) · ( E S ) S ∨ ∼ S C E Invalid form 2. (a) T = I take statistics. M = Statistics is offered in the morning. T M M T Modus tollens (b) J = Frank is jealous of Cindy. F = Frank was following Cindy around yesterday with a sour expression. J F F J Affirming the consequent (c) R = Salmon reliably return from the ocean to the streams in which they were spawned. M = Salmon have some means of detecting subtle differences in the chemical composition of the water of those streams at the point where the flow into the ocean. 1
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R M R M (unstated) Modus ponens (d) S = We send in the troops. N = We negotiate. S N N S Disjunctive syllogism (e) C = We can reduce the interest rate by 2%.
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exercise21answers - Exercise 21 Answers Philosophy 102...

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