Proposition isaprop_regular_epi_pb_stable (C : category) : isaprop (regular_epi_pb_stable C). Proof. do 11 (use impred ; intro). apply isaprop_is_regular_epi. Qed.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Prelude. Require Import UniMath.CategoryTheory.Limits.Coequalizers. Require Import UniMath.CategoryTheory.Limits.Pullbacks. Require Import UniMath.CategoryTheory.Epis.