PHIL0005: Introduction to Logic 1 Mock Examination III
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PHIL0005: Introduction to Logic 1
Mock Examination III
1. Consider the following argument:
The UK will lift all social distancing rules only if the curve is flattened and stays so until February. But the curve will not stay flat until February unless a vaccine is found. Therefore, it is necessary that a vaccine is found for the UK to lift all social distancing rules.
(a) Identify the premisses and the conclusion and formalise the argument in c1 , providing a dictionary. (10 points)
(b) Decide whether the original argument is propositionally valid using your favourite method. (15 points)
2. Consider the following two c1 sentences:
-(P 4 Q) (1)
-P 4 Q (2)
(a) Are they logically equivalent? (10 points)
(b) Is the set that contains (2) and the negation of (1) satisfiable? (10 points)
(c) Decide if each of them is a contingent sentence, a tautology, or a contradiction. (5 points)
3. Decide if the following claims are true or false.
(a) If ϕ and ψ are both contingencies, then they can’t be logically equivalent. (10 points) (b) If (ϕ, ψ} is satisfiable, then ϕ 乒 -ψ . (10 points)
4. Show that P ^ (Q A R) 上 (P ^ Q) A (P ^ R). (10 points)
2022-08-29