proposition: Theorem href_of C : pref F C -> href C.
proof: Proof. Proof using sfc_F. elim => *;[ apply: adm_P1 | apply: adm_P2 ]; eassumption. Qed.
imports: Relations mathcomp.ssreflect.ssreflect mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset base modular_hilbert) CompDecModal.PDL(PDL_def demo)