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

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Question

Using the truth table prove the following logical equivalence.

(p ∨ q) → r ≡ (p → r) ∧ (q → r)

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Solution

1 2 3 4 5 6 7 8
p q r p ∨ q (p ∨ q) → r p → r q → r (p → r) ∧ (q → r)
T T T T T T T T
T T F T F F F F
T F T T T T T T
T F F T F F T F
F T T T T T T T
F T F T F T F F
F F T F T T T T
F F F F T T T T

The entries in columns 5 and 8 are identical.

∴ (p ∨ q) → r ≡ (p → r) ∧ (q → r)

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