proposition: Lemma list_extend_empty: fset_extend f ∅ = ⊥.
proof: Proof. reflexivity. Qed.
imports: Coq.Lists.List Coq.Lists.SetoidList MathClasses.implementations.list MathClasses.interfaces.abstract_algebra MathClasses.interfaces.finite_sets MathClasses.interfaces.orders MathClasses.theory.lattices MathClasses.orders.lattices