Answered: 1. Which of the following are…

1. Which of the following are tautologies, contradictions, or contingents? a) - (pAq) (-p) v (- q) b) bAc Ad- (d → b) c) (p v q) A (-p) ^(-9) d) (p→ q) ^ (q –p) e) p- (q V r) A (p →¬r)

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

1. Which of the following are tautologies, contradictions, or contingents?
a) – (p A q) → (- p) v (- q)
b) bAc A d- (d → b)
c) (p V q) A (- p) A (- q)
d) (p → q) ^ (q –→p)
e) p- (q V r) ^ (p → ¬ r)

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