Proposition cha_max_comm {H : complete_heyting_algebra} (x y : H) : (x ∨ y) = (y ∨ x). Proof. exact (iscomm_Lmax H x y). 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.