Module Mf(M:Sigf)<:Sigf
with Definition f:=M.f
with Definition f_1:=M.f_1.
Definition f:=M.f.
Definition f_1:=M.f_1.
Definition exd_f:=M.exd_f.
Definition exd_f_1:=M.exd_f_1.
Definition bij_f:=M.bij_f.
Definition bij_f_1:=M.bij_f_1.
Definition f_1_f:=M.f_1_f.
Definition f_f_1:=M.f_f_1.
(*======================================================== ITERATIONS IN ORBITS: WITH NOETHERIAN INDUCTION =======================================================*)
(* REMAINING DARTS DURING f ITERATION ON z STARTING FROM A set sx: *)
(*======================================================== EXISTENCY PROPERTIES OF ITERATED DARTS, upb IN ORBITS...: WITH NOETHERIAN IND. =======================================================*)
(* FOR THE FOLLOWING LEMMA: *)
Definition P1
(m:fmap)(z:dart)(s:set):Prop:=
let sr := Iter_rem_aux m z s in
let n := Iter_upb_aux m z s in
~ exds sr (Iter (f m) n z).
(* THE upb_ITERATED DART BY f DOES NOT REMAIN: *)
(* THE upb_ITERATED DART BY f DOES NOT REMAIN: *)
(* THE upb_ITERATED DART BY f IS IN m: *)
(* THE upb_ITERATED DART BY f IS IN THE COMPLEMENTARY: *)
(* NOT REMAINING EQUIVALENT TO BEING IN THE COMPLEMENTARY: *)

Lemma exds_rem_orb:forall(m:fmap)(z t:dart),
inv_hmap m -> exd m t ->
(~exds (Iter_rem m z) t <-> exds (Iter_orb m z) t).