fact: Definition bool_fun_ext (bf : bool_fun) := forall vb vb' : var_binding, var_binding_eq vb vb' -> bool_fun_eval bf vb = bool_fun_eval bf vb'.
imports: Bool Sumbool Arith ZArith NArith Nnat Ndec Ndigits IntMap(Allmaps) Wf_nat BDDvar_ad_nat bdd1 bdd2