(*===========================================================
                expe AND bottom
============================================================*)

(* expo and between in an edge: *)

Definition expe(m:fmap)(z t:dart):=
  MA0.expo m z t.Definition betweene(m:fmap)(z v t:dart):=
  MA0.between m z v t.

Lemma cA0_1_MA0_1:forall(m:fmap)(z:dart), cA_1 m zero z = MA0.f_1 m z.