proposition: Lemma LS_sound s : LS.prv s -> prv s.
proof: Proof. elim => {s} *; eauto using prv,ERel,ARel,axARf,axERf,axAUcmp,axSer. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset base modular_hilbert) CompDecModal.CTL(CTL_def hilbert hilbert_hist)