Prove that following proposition is a tautology using the rules of inference from the book (DO NOT use substitution).    (p∧q) → ¬(p → ¬q)

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
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Prove that following proposition is a tautology using the rules of inference
from the book (DO NOT use substitution). 

 

(p∧q) → ¬(p → ¬q) 

Expert Solution
Step 1

We are given a statement and we are going to prove that its a tautology.

Note: 

To be a tautology, we just need to prove that all values will be true no matter what the values of p and q are, which means our statement must result to 1 at the end. Please refer to image for the solution. I have mentioned the rules used on the side and have underlined the part which will be solved next. 

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