proposition: Lemma add_eq_b m x y e : K.eq x y -> mem y (add x e m) = true.
proof: Proof. intros <-. apply mem_spec, add_in_iff. now left. Qed.
imports: Coq(Bool Equalities Orders OrdersFacts OrdersLists) Coq(Morphisms Permutation SetoidPermutation) MMaps(Utils Comparisons Interface)