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erutuf/exo5.v

Created July 18, 2015 07:50
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exo5.v
Require Import ssreflect.
Lemma exo5 : forall A B C : Prop, A /\ B <-> B /\ A.
Proof.
move=> A B P.
split.
case.
move=> a b.
split.
exact b.
exact a.
case.
move=> b a.
split.
exact a.
exact b.
Qed.
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