proposition: Lemma inhab_Req C : exists D, D \in Req C.
proof: Proof. exists (R C). by rewrite !inE. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset base sltype) CompDecModal.CTL(CTL_def dags)