Rules of inference. Answer 3

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Rules of inference. Answer 3

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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