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Using the truth table prove the following logical equivalence. [∼ (p ∨ q) ∨ (p ∨ q)] ∧ r ≡ r - Mathematics and Statistics

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Question

Using the truth table prove the following logical equivalence.

[∼ (p ∨ q) ∨ (p ∨ q)] ∧ r ≡ r

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Solution

1 2 3 4 5 6 7
p q r p ∨ q ∼ (p ∨ q) ∼ (p ∨ q) ∨ (p ∨ q) [∼ (p ∨ q) ∨ (p ∨ q)] ∧ r
T T T T F T T
T T F T F T F
T F T T F T T
T F F T F T F
F T T T F T T
F T F T F T F
F F T F T T T
F F F F T T F

The entries in columns 3 and 7 are identical.
∴ [∼ (p ∨ q) ∨ (p ∨ q)] ∧ r ≡ r

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Chapter 1: Mathematical Logic - Exercise 1.2 [Page 13]
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