proposition: Lemma meet_le x y z : z ≤ x -> z ≤ y -> z ≤ x ⊓ y.
proof: Proof. apply meet_glb. Qed.
imports: HoTT.Classes.interfaces.abstract_algebra HoTT.Classes.interfaces.orders HoTT.Classes.orders.semirings HoTT.Classes.theory.lattices