proposition: Lemma axEUr s t u : prv (fAG (u ---> ~~:t :/\: (s ---> fAX u)) ---> u ---> ~~: fEU s t).
proof: Proof. exact: axEUr'. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset base modular_hilbert) CompDecModal.CTL(CTL_def hilbert)