fact: Definition idsigmatosigmaid {A : UU} {B : A → UU} (c_1 c_2 : total2 B) : c_1 = c_2 → total2 (λ v : pr1 c_1 = pr1 c_2, transportf B v (pr2 c_1) = pr2 c_2).
imports: UniMath.Foundations.All UniMath.Induction.PolynomialFunctors UniMath.CategoryTheory.Core.Functors UniMath.Induction.FunctorAlgebras_legacy