proposition: Lemma ShortShortExactData_opp_Eq {C : category} {Z : Zero C} (SSED : ShortShortExactData C Z) : Mor1 (MorphismPair_opp SSED) · Mor2 (MorphismPair_opp SSED) = ZeroArrow (Zero_opp C Z) (Ob1 (MorphismPair_opp SSED)) (Ob3 (MorphismPair_opp SSED)).
proof: Proof. use (pathscomp0 (@ShortShortExactData_Eq C Z SSED)). rewrite <- ZeroArrow_opp. apply idpath. Qed.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.MoreFoundations.Notations UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.opp_precat UniMath.CategoryTheory.Limits.Zero UniMath.CategoryTheory.Limits.Opp