proposition: Lemma FiberExt_eq2 {C1 C2 : Complex A} (f g : Morphism C1 C2) (H : ComplexHomot A C1 C2) (Comm : to_binop _ _ ((f : (ComplexPreCat_Additive A)⟦_, _⟧)) (to_inv ((g : (ComplexPreCat_Additive A)⟦_, _⟧))) = ComplexHomotMorphism A H) : (((FiberExt g f (InvHomot H) (InvHomotEq f g H Comm)) : (ComplexPreCat_Additive A)⟦_, _⟧) · ((FiberExt f g H Comm) : (ComplexPreCat_Additive A)⟦_, _⟧)) = (identity _).
proof: Proof. use MorphismEq. intros i. cbn. unfold FiberExtMor. unfold InvHomot. cbn. set (DS1 := to_BinDirectSums A (C1 (i + 1)) (C2 i)). set (DS4 := to_BinDirectSums A (C1 (i + 1 + 1)) (C2 (i + 1))). rewrite <- (to_BinOpId DS1). rewrite to_premor_linear'. rewrite to_premor_linear'. rewrite to_postmor_linear'. rewrite to_postmor_linear'. rewrite to_postmor_linear'. rewrite to_postmor_linear'. rewrite to_postmor_linear'. rewrite to_postmor_linear'. rewrite assoc. rewrite assoc. rewrite assoc. rewrite assoc. rewrite assoc. rewrite assoc. rewrite assoc. rewrite assoc. rewrite assoc. rewrite assoc. rewrite assoc. rewrite assoc. rewrite assoc. rewrite <- (assoc _ _ (to_Pr2 DS1)). rewrite <- (assoc _ _ (to_Pr2 DS1)). rewrite <- (assoc _ _ (to_Pr2 DS1)). rewrite <- (assoc _ _ (to_Pr1 DS1)). rewrite <- (assoc _ _ (to_Pr1 DS1)). rewrite <- (assoc _ _ (to_Pr1 DS1)). rewrite (to_IdIn1 DS1). rewrite (to_IdIn2 DS1). rewrite (to_Unel1' DS1). rewrite (to_Unel2' DS1). unfold DiffTranslationComplex. rewrite ZeroArrow_comp_right. rewrite ZeroArrow_comp_right. rewrite ZeroArrow_comp_right. rewrite ZeroArrow_comp_left. rewrite ZeroArrow_comp_left. rewrite ZeroArrow_comp_left. rewrite id_right. rewrite id_right. rewrite id_right. rewrite to_runax''. rewrite to_runax''. rewrite to_runax''. rewrite to_lunax''. apply maponpaths. rewrite <- transport_target_to_inv. rewrite <- PreAdditive_invrcomp. rewrite <- PreAdditive_invlcomp. rewrite <- to_assoc. rewrite (@to_rinvax' A (Additive.to_Zero A)). rewrite to_lunax''. apply idpath. Qed.
imports: UniMath.Foundations.UnivalenceAxiom UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.Foundations.NaturalNumbers UniMath.MoreFoundations.PartA UniMath.Algebra.BinaryOperations UniMath.Algebra.Monoids UniMath.NumberSystems.Integers UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.TransportMorphisms UniMath.CategoryTheory.Limits.Zero UniMath.CategoryTheory.Limits.BinProducts UniMath.CategoryTheory.Limits.BinCoproducts UniMath.CategoryTheory.Limits.Equalizers UniMath.CategoryTheory.Limits.Coequalizers UniMath.CategoryTheory.Limits.Kernels UniMath.CategoryTheory.Limits.Cokernels UniMath.CategoryTheory.Limits.Pushouts UniMath.CategoryTheory.Limits.Pullbacks UniMath.CategoryTheory.Limits.BinDirectSums UniMath.CategoryTheory.Monics UniMath.CategoryTheory.Epis UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Adjunctions.Core UniMath.CategoryTheory.Equivalences.Core UniMath.CategoryTheory.CategoriesWithBinOps UniMath.CategoryTheory.PrecategoriesWithAbgrops UniMath.CategoryTheory.PreAdditive UniMath.CategoryTheory.Additive UniMath.CategoryTheory.Abelian UniMath.CategoryTheory.AbelianToAdditive UniMath.CategoryTheory.AdditiveFunctors UniMath.HomologicalAlgebra.Complexes UniMath.HomologicalAlgebra.KA UniMath.HomologicalAlgebra.TranslationFunctors