fact: Definition compareP2withP2h2 {X Y : UU} {f g : X → Y} (alpha : f ~ g) : P_2 (funextfun _ _ alpha) = funextfun _ _ (P_2_h alpha).
imports: UniMath.Foundations.All UniMath.Induction.PolynomialFunctors UniMath.CategoryTheory.Core.Functors UniMath.Induction.FunctorAlgebras_legacy