proposition: Lemma isaprop_isTrue (C : ComplementaryPair) : isaprop (isTrue C).
proof: Proof. intros. apply (isapropcomponent1 (isTrue C) (isFalse C)). apply isapropifcontr. apply complementaryDecisions. Defined.
imports: UniMath.MoreFoundations.Notations UniMath.MoreFoundations.Tactics