Definition islunit_Lmin_Ltop : islunit (Lmin l) (Ltop l) := pr2 (pr2 (pr2 (pr2 l))).
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.MoreFoundations.Propositions. Require Import UniMath.Algebra.Monoids. Require Import UniMath.Algebra.Groups. Require Import UniMath.OrderTheory.Lattice.Lattice.