proposition: Lemma join_ub_3_assoc_r x y z : z ≤ x ⊔ (y ⊔ z).
proof: Proof. transitivity (y ⊔ z); apply join_ub_r. Qed.
imports: HoTT.Classes.interfaces.abstract_algebra HoTT.Classes.interfaces.orders HoTT.Classes.orders.semirings HoTT.Classes.theory.lattices