Proposition cha_le_antisymm {H : complete_heyting_algebra} {x y : H} (p : x ≤ y) (q : y ≤ x) : x = y. Proof. exact (isantisymm_Lle H x y p q). Qed.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.OrderTheory.Lattice.Lattice. Require Import UniMath.OrderTheory.Lattice.Bounded. Require Import UniMath.OrderTheory.Lattice.Heyting.