fact: Definition weqfromaidalgmaptoalg2cell {XX YY : algebra_ob P} (ff gg : algebra_mor P XX YY) : weq (ff = gg) (algebra_2cell ff gg).
imports: UniMath.Foundations.All UniMath.Induction.PolynomialFunctors UniMath.CategoryTheory.Core.Functors UniMath.Induction.FunctorAlgebras_legacy