(*========================================================== ============================================================ TOPOLOGICAL FMAPS, HMAPS -  WITH TAGS AND EMBEDDINGS  PART 4:  MAPS, OPERATIONS, PROPERTIES / B, L_B...  COMPLETE: OK! ============================================================ ==========================================================*)
Require Export Jordan3.
(*========================================================== expf_B : expf on B ===========================================================*)
(* OK: *)
(* OK: *)

Lemma exd_L_B:forall (m:fmap)(k:dim)(x z:dart),
inv_hmap m -> succ m k x ->
let y:= A m k x in
exd (L (B m k x) k x y) z <-> exd m z.