(* FINALLY, THE OTHER ORBITS ARE INCHANGED: *)

Lemma not_expf_L1_y0: forall(m:fmap)(x y z:dart),
let m1:= L m one x y in
let y0:= cA m zero y in
inv_hmap m1 -> ~expf m x y0
-> ~expf m x z -> ~expf m y0 z ->
~expf m1 y0 z.