fact: Definition boolean_algebra_is_boolean : is_boolean boolean_algebra_lattice := pr2 B.
imports: UniMath.Foundations.Preamble UniMath.Algebra.Monoids UniMath.OrderTheory.Lattice.Lattice UniMath.OrderTheory.Lattice.Bounded UniMath.OrderTheory.Lattice.Complement UniMath.OrderTheory.Lattice.Distributive UniMath.OrderTheory.Lattice.Heyting