proposition: Lemma meet_lb_3_m x y z : x ⊓ y ⊓ z ≤ y.
proof: Proof. transitivity (x ⊓ y). now apply meet_lb_l. now apply meet_lb_r. Qed.
imports: MathClasses.interfaces.abstract_algebra MathClasses.interfaces.orders MathClasses.orders.maps MathClasses.theory.lattices