fact: Axiom add_test_constraint_left_true_sound : forall v1 v2 v x1 x2, add_test_constraint_left true v1 v2 = Some v -> to_p v1 x1 -> to_p v2 x2 -> x1 < x2 -> to_p v x2.
imports: syntax little denot Bool List String ZArith axiom