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 BDDunique :
forall (cfg : BDDconfig) (node1 node2 : ad),
BDDconfig_OK cfg ->
config_node_OK cfg node1 ->
config_node_OK cfg node2 ->
bool_fun_eq (bool_fun_of_BDD cfg node1) (bool_fun_of_BDD cfg node2) ->
Neqb node1 node2 = true.