. a. Use a truth table to verify that A S (B S C) 4 (A ` B) S C is a tautology. b. Prove
Chapter 1, Problem 55(choose chapter or problem)
. a. Use a truth table to verify that A S (B S C) 4 (A ` B) S C is a tautology. b. Prove that A S (B S C) 3 (A ` B) S C by using a series of equivalences. c. Explain how this equivalence justifies the deduction method that says: to prove P1 ` P2 ` ` Pn S (R S S), deduce S from P1, P2, , Pn, and R.
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