proposition: Lemma label_root (p : DF * DC) : label (root (Frag p)) = val (p.2).
proof: Proof. apply/DG1 : (FragP p). Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset base sltype) CompDecModal.CTL(CTL_def dags)