proposition: Lemma ERI s t : prv (s ---> t ---> fER s t).
proof: Proof. apply: rAIL. apply ERel. rule axAcase; do 2 Intro. ApplyH axAI. ApplyH axOIl. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset base modular_hilbert) CompDecModal.CTL(CTL_def hilbert hilbert_hist)