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