fact: Definition tau_comp {X Y : UU} {f : X → Y} (x : A) (u : B x → X) : tau x u (λ y : B x, idpath (f (u y))) = idpath (x ,, u ;; f).
imports: UniMath.Foundations.All UniMath.Induction.PolynomialFunctors UniMath.CategoryTheory.Core.Functors UniMath.Induction.FunctorAlgebras_legacy