Build truth tables for the following three wffs: 1. (A  ⊃  (~A v ~B))   ⊃   (A v ~ B)

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
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Build truth tables for the following three wffs:

1. (A  ⊃  (~A v ~B))   ⊃   (A v ~ B)

2. ( (A v B) & ((~A ⊃ B) ⊃ B)) ⊃  (A ⊃ ~B)

3. (A ⊃ B) v (~B v (A ⊃ ~ B))

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