fact: Definition bool_fun_if (x : BDDvar) (bf bf' : bool_fun) : bool_fun := fun vb : var_binding => ifb (vb x) (bf vb) (bf' vb).
imports: Bool Sumbool Arith ZArith NArith Nnat Ndec Ndigits IntMap(Allmaps) Wf_nat BDDvar_ad_nat bdd1 bdd2 bdd3 bdd4 bdd5_1 bdd5_2