fact: Definition polynomial_functor_obj := fun (X : UU) => ∑ (a : A), B a → X.
imports: UniMath.Foundations.Preamble UniMath.Foundations.PartA UniMath.Foundations.UnivalenceAxiom UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.Induction.FunctorAlgebras_legacy UniMath.Induction.FunctorCoalgebras_legacy UniMath.CategoryTheory.Categories.Type.Core