proposition: Lemma ax_test s t : prv ([s??]t <--> (s ---> t)).
proof: Proof. rule axEI. exact: axTestE. exact: axTestI. Qed.
imports: Relations Lia Setoid Morphisms mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset base modular_hilbert sltype rewrite_inequality fset_tac)