proposition: Lemma axSer : prv (EX (fF ---> fF)).
proof: Proof. change (prv (~~: AX (~~: (~~: fF)))). rewrite -> axDNE. exact: ax_serial. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset base modular_hilbert) CompDecModal.CTL(CTL_def hilbert)