proposition: Lemma ax_serial : prv (~~: (fAX fF)).
proof: Proof. Intro. ApplyH (axSer fF). drop. apply: rNec. exact: axI. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset base modular_hilbert) CompDecModal.CTL(CTL_def hilbert hilbert_hist)