proposition: Lemma axAUcmp s t : prv (fAU s t <--> ~~: fER (~~: s) (~~: t)).
proof: Proof. exact: axAUcmp'. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset base modular_hilbert) CompDecModal.CTL(CTL_def hilbert hilbert_hist)