proposition: Lemma ax_serial : prv (fAX fF ---> fF).
proof: Proof. rewrite -> axAXdef. Intro. Apply. drop. exact: axSer. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset base modular_hilbert) CompDecModal.CTL(CTL_def hilbert)