proposition: Lemma meet_lb_3_assoc_m x y z : x ⊓ (y ⊓ z) ≤ y.
proof: Proof. transitivity (y ⊓ z). now apply meet_lb_r. now apply meet_lb_l. Qed.
imports: MathClasses.interfaces.abstract_algebra MathClasses.interfaces.orders MathClasses.orders.maps MathClasses.theory.lattices