Show that: ¬q 1) p→¬q 2) (p∧r)∨s 3) s→(t∨u) 4) ¬t∧¬u   where ¬ is denied.

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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Subject : calculas

Show that: ¬q

1) p→¬q

2) (p∧r)∨s

3) s→(t∨u)

4) ¬t∧¬u

 

where ¬ is denied.

 

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