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KeenS/1-2.v

Created April 7, 2014 13:10
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1-2.v
Theorem Modus_tollens : forall P Q : Prop, ~Q /\ (P -> Q) -> ~P.
Proof.
intros.
destruct H.
intro.
apply H.
apply H0.
apply H1.
Qed.
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ghost commented Apr 7, 2014

highlights

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