proposition: Lemma hist0 s : prv (s ---> s :/\: hist fset0).
proof: Proof. Intro. ApplyH axAI. drop. rewrite /hist fset0Es big_nil. exact: axI. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset base modular_hilbert sltype) CompDecModal.CTL(CTL_def gen_def hilbert hilbert_hist)