Introduction to Logic Online Course, Week 5: Natural Deduction Proof Method: Rules of Implication II

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This video covers the following implication rules for propositional logic natural deduction: Simplification (Simp), Conjunction (Conj), Addition (Add), and Constructive Dilemma (CD)
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You’ve helped me so much!! You may be the only reason I pass this class!!

jennmcwhorter
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I suppose that one elegant proof to 01:07:45 might be as follows:

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5. !K 4 simp
6. L v !M 3, 5 MP
7. J v !O 2, 6 CD
8. K v !P 1, 7, CD
9. !P 5, 8 DS

begumka
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How can we proove ~p|~q is equal to ~(p&q)
Can u help me

arunkrishnan