fact: Definition weqfiberwise2cellto2cellalt {XX YY : algebra_ob P} (ff gg : algebra_mor P XX YY) (e : pr1 ff = pr1 gg) : isalg2cell ff gg e ≃ isalg2cellalt ff gg e.
imports: UniMath.Foundations.All UniMath.Induction.PolynomialFunctors UniMath.CategoryTheory.Core.Functors UniMath.Induction.FunctorAlgebras_legacy