Proposition cha_max_id {H : complete_heyting_algebra} (x : H) : (x ∨ x) = x. Proof. exact (Lmax_id H x). 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.