(* WITH THE REPLACEMENT, OK: *)

Lemma expf_expf_L0_3_bis:forall (m:fmap)(x y z:dart),
inv_hmap (L m zero x y) ->
let x0 := cA m zero x in
let x_1 := cA_1 m one x in
~ expf m x_1 y ->
expf m x_1 z ->
expf (L m zero x y) x_1 z.