proposition: Corollary valid_dec s : decidable (forall (M:cmodel) (w:M), eval s w).
proof: Proof. exact: valid_dec. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset modular_hilbert base sltype) CompDecModal.K(K_def demo hilbert_ref gentzen universal_model)