Each of the following exercises presents a flawless formal proof of validity for the indicated argument. For

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Each of the following exercises presents a flawless formal proof of validity for the indicated argument. For each proof, state the justification for each inferred statement (i.e., each statement that is not a premise).


1. N ⊃ O
2. (N ⋅ O) ⊃ P
3. ~ (N ⋅ P)
∴ ~ N
4. N ⊃ (N ⋅ O)
5. N ⊃ P
6. N ⊃ (N ⋅ P)
7. ~ N

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Introduction To Logic

ISBN: 9781138500860

15th Edition

Authors: Irving M. Copi, Carl Cohen, Victor Rodych

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