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GallagherCommaJack/contrpos_classic.v

Last active August 29, 2015 14:17
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contrpos_classic.v
Theorem contr_pos_eq_classic :
(forall P Q, (~ Q -> ~ P) -> P -> Q) ->
forall P, ~~ P -> P.
Proof. intros H P nnP. apply H with (Q := P) in nnP; intuition. Qed.
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