fact: Definition isalg2cell {XX YY : algebra_ob P} (ff gg : algebra_mor P XX YY) (e: pr1 ff = pr1 gg) : UU := pr2 ff @ (comppathwithfun (maponpaths (# P) e) (pr2 YY)) = compfunwithpath (alg_map P XX) e @ (pr2 gg).
imports: UniMath.Foundations.All UniMath.Induction.PolynomialFunctors UniMath.CategoryTheory.Core.Functors UniMath.Induction.FunctorAlgebras_legacy