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Prove that the following pair of statement pattern is equivalent. p → q and ~ q → ~ p and ~ p ∨ q - Mathematics and Statistics

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Question

Prove that the following pair of statement pattern is equivalent.

p → q and ~ q → ~ p and ~ p ∨ q

Sum
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Solution

1 2 3 4 5 6 7
p q ~p ~q p→q ~q→~p ~p∨q
T T F F T T T
T F F T F F F
F T T F T T T
F F T T T T T

In the above table, entries in columns 5, 6 and 7 are identical

∴ Statement p → q and ~q → ~p and ~p ∨ q are equivalent.

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Chapter 1: Mathematical Logic - Exercise 1.6 [Page 16]

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