proposition: Lemma refpred_tref C : ref F C -> tref C.
proof: Proof. Proof using sfc_F. by elim => *; eauto using tref_R1, tref_R2, tref_R3. Qed.
imports: Relations Lia mathcomp.ssreflect.ssreflect mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset base modular_hilbert sltype) CompDecModal.Kstar(Kstar_def demo hilbert_ref gen_def)