proposition: Lemma mapi_b m x (f:key->elt->elt') : mem x (mapi f m) = mem x m.
proof: Proof. apply eq_bool_alt; rewrite !mem_spec. apply mapi_in_iff. Qed.
imports: Coq(Bool Equalities Orders OrdersFacts OrdersLists) Coq(Morphisms Permutation SetoidPermutation) MMaps(Utils Comparisons Interface)