proposition: Lemma box_request (C : clause) : prv ([af C] ---> AX [af R C]).
proof: Proof. rewrite <- bigABBA. apply: bigAI. case => [s [|]]; last by rewrite (negbTE (Rpos _ _)). rewrite RE. exact: bigAE. Qed.
imports: Relations mathcomp.ssreflect.ssreflect mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset base modular_hilbert sltype)