fact: Definition cochain_weq {C : precategory} : (∑ (obs : ∏ n : nat, ob C), (∏ n : nat, obs (S n) --> obs n)) ≃ cochain C.
imports: UniMath.Foundations.PartA UniMath.CategoryTheory.Core.Categories UniMath.Foundations.NaturalNumbers UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Limits.Graphs.Colimits UniMath.CategoryTheory.Limits.Graphs.Limits UniMath.CategoryTheory.Limits.Terminal