I. Prove the validity of the following argument: 1. p-9 (¬r) V (¬9) 2. p → 9 sVr r → ¬9 .s Vt 3. p → 9 pVr s V ¬r * n9 → s

Database System Concepts
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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Chapter1: Introduction
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Rules of inference. Answer 1

I.
Prove the validity of the following argument:
1.
p → q
(¬r) V (¬q)
: -p
p → q
s Vr
r → ¬9
.: s Vt
3.
p → 9
p V r
s V ¬r
: ¬9 → s
Transcribed Image Text:I. Prove the validity of the following argument: 1. p → q (¬r) V (¬q) : -p p → q s Vr r → ¬9 .: s Vt 3. p → 9 p V r s V ¬r : ¬9 → s
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