Know Your Logical Proofs [Pic]

[Source: SMBC]

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3 Responses to Know Your Logical Proofs [Pic]

  1. 1 wrong points here:-
    Proof by tradition:- See 'proof by contraposition' – 7P is to forward arrow F.. Then how can right diagonal arrow 7R be the son?
    Or am I missing something here in the equation?

    • also, in 'by tradition' doesn't the end of the equation say Not R? when in fact the problem is that it is R?