Construct a proof of validity for the following valid argument using the 9 rules of inference.?
1. (~M & ~N) > [(M v H) > (K & L)]
2. ~M & (C > D)
3. ~N & (F <> G) / K&~N
Construct a proof of validity for the following valid argument using the 9 rules of inference.?
I know that everything devolves to mathematics, but I see no philosophy in this math problem. If I knew what ~ & and v meant as math maybe I would see logic in it, but without a key, it is just some arcane formula.
Construct a proof of validity for the following valid argument using the 9 rules of inference.?
Can you give us something that proves these wrong?
Reply:Are you sure that you typed the argument in correctly? It doesn't appear valid. The conclusion is K & ~N.
~N is true from premise 3. But K is true when (M v H) is true. (M v H) is true when M is true or H is true. Such is not the case.
The proof would work if (M v H) in the first line was instead (~M v H).
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