proposition: Lemma supp_edge (p : DF * DC) (x y : Frag p) s : label x |> fAX s^+ -> edge x y -> label y |> s^+.
proof: Proof. rewrite -[_ y |> _]suppC1 => H xy. move: (dag_R xy). apply: suppC_sub. by rewrite fsub1 RE. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(all_ssreflect) CompDecModal.libs(edone bcase fset base sltype) CompDecModal.CTL(CTL_def dags)