Definition unit_cha : complete_heyting_algebra. Proof. use make_complete_heyting_algebra. - exact unitset. - exact unit_bounded_lattice. - exact unit_complete_lattice. - exact unit_lattice_exponential. Defined.
Require Import UniMath.MoreFoundations.All. Require Import UniMath.Algebra.BinaryOperations. Require Import UniMath.OrderTheory.Lattice.Lattice. Require Import UniMath.OrderTheory.Lattice.Bounded. Require Import UniMath.OrderTheory.Lattice.Heyting. Require Import UniMath.OrderTheory.Lattice.CompleteHeyting.