Section Components.
Variable cfg : BDDconfig.
Hypothesis cfg_OK : BDDconfig_OK cfg.
Definition bs_of_cfg := fst cfg.
Definition share_of_cfg := fst (snd cfg).
Definition fl_of_cfg := fst (snd (snd cfg)).
Definition cnt_of_cfg := fst (snd (snd (snd cfg))).
Definition negm_of_cfg := fst (snd (snd (snd (snd cfg)))).
Definition orm_of_cfg := fst (snd (snd (snd (snd (snd cfg))))).
Definition um_of_cfg := snd (snd (snd (snd (snd (snd cfg))))).

Lemma node_preserved_bs_node_height_eq :
forall (bs bs' : BDDstate) (node : ad),
BDDstate_OK bs ->
BDDstate_OK bs' ->
node_preserved_bs bs bs' node ->
node_OK bs node ->
Neqb (bs_node_height bs' node) (bs_node_height bs node) = true.