fact: Definition bool_fun_restrict (bf : bool_fun) (x : BDDvar) (b : bool) (vb : var_binding) := bool_fun_eval bf (augment vb x b).
imports: Bool Sumbool Arith ZArith NArith Nnat Ndec Ndigits IntMap(Allmaps) Wf_nat BDDvar_ad_nat bdd1 bdd2