Logical Equivalence Involving Tautology

Example: Show that r ∧ t ≡ r

Truth Table for r ∧ t
r tr ∧ t
T T T
F T F

Exercises

Exercise 1: Tautology
Use truth table to show that ( p ∧ q ) ∨ (~p ∨ ( p ∧ ~q )) is a tautology.
Solution:
Tautology Solution

Exercise 2: Contradiction
Use truth table to show that (p ∧ ~ q) ∧ (~p ∨ q) is a contradiction.
Solution:
Contradiction Solution

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Date of last modification: February 27, 2019