proposition: Lemma fset_meet_singletons_eq_r x y : {{ x }} ⊓ {{ y }} = {{ y }} ↔ x = y.
proof: Proof. rewrite commutativity, fset_meet_singletons_eq_l. intuition. Qed.
imports: MathClasses.theory.lattices MathClasses.varieties.monoids MathClasses.implementations.bool MathClasses.implementations.list_finite_set MathClasses.orders.lattices MathClasses.interfaces.abstract_algebra MathClasses.interfaces.finite_sets MathClasses.interfaces.orders