fact: Definition is_tauto (be : bool_expr) := N.eqb BDDone (fst (snd (BDDof_bool_expr initBDDconfig initBDDneg_memo initBDDor_memo be))).
imports: Bool Sumbool Arith ZArith NArith Nnat Ndec Ndigits IntMap(Allmaps) Wf_nat BDDvar_ad_nat bdd1 bdd2 bdd3 bdd4 bdd5_1 bdd5_2 bdd6 bdd7 BDDdummy_lemma_2 BDDdummy_lemma_3 BDDdummy_lemma_4 bdd8 bdd9 bdd10 bdd11