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(* as published by the Free Software Foundation; either version 2.1   *)
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(* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the      *)
(* GNU General Public License for more details.                       *)
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(* 02110-1301 USA                                                     *)

Lemma BDDneg_memo_OK_1_lemma_2_1' :
forall (cfg : BDDconfig) (memo : BDDneg_memo),
BDDconfig_OK cfg ->
BDDneg_memo_OK_2 cfg memo ->
BDDneg_memo_OK_2 cfg (BDDneg_memo_put memo BDDzero BDDone).