(*=========================================================== CONSEQUENCES FOR PARTICULAR CASES: ===========================================================*)
(* WHAT ARE y, x0... AFTER L0: *)

Lemma y_0_1_L0:forall (m:fmap)(x y:dart),
let m1 := L m zero x y in
inv_hmap m1 ->
cF m y = cA_1 m1 one (top m1 zero x).