Definition BDDuniv_memo_put (cfg : BDDconfig) (x : BDDvar)
(node node' : ad) :=
match cfg with
| (bs, (share, (fl, (cnt, (negm, (orm, um)))))) =>
(bs, (share, (fl, (cnt, (negm, (orm, MapPut2 ad um node x node'))))))
end.

Lemma BDDum_put_nodes_preserved :
forall (cfg : BDDconfig) (x : BDDvar) (node node' : ad),
nodes_preserved cfg (BDDuniv_memo_put cfg x node node').