proposition: Lemma eq_false_not_true: forall b : bool, b = false -> b <> true.
proof: Proof. intuition. subst. discriminate H0. Qed.
imports: Coq(List) JML(Stack) Coq(ListSet) Coq(Bool) Coq(ZArith) Coq(Relation_Operators) JML(ListHelpers) Coq(Classical)