proposition: Lemma Sum_β_r {C: HSET} (f: pr1hSet A -> pr1hSet C) (g: pr1hSet B -> pr1hSet C): (Sum_rec f g) ∘ Sum_inr = g.
proof: Proof. apply idpath. Defined.
imports: UniMath.Foundations.Init UniMath.Foundations.Preamble UniMath.Foundations.PartA UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.FunctorAlgebras UniMath.CategoryTheory.Categories.HSET.Core UniMath.CategoryTheory.Categories.HSET.Structures