Prove the following using RULES of INFERENCE/REPLACEMENT: 1. P → Q 2. R → S 3. ﬢQ ۷ ﬢS Therefore: ﬢP ۷ ﬢR

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Prove the following using RULES of INFERENCE/REPLACEMENT:

1. P → Q

2. R → S

3. ﬢQ ۷ ﬢS

Therefore: ﬢP ۷ ﬢR

 

Please use the different rules of inference: Addition, conjunction, simplification, modus ponens, modus tolens, etc.

The different rules of replacement: Idemptotence, commutativity, associativity, etc. 

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