diff options
| author |  Enrico Tassi <gareuselesinge@debian.org> | 2015-01-25 14:42:51 +0100 |
|---|---|---|
| committer | Enrico Tassi <gareuselesinge@debian.org> | 2015-01-25 14:42:51 +0100 |
| commit | 7cfc4e5146be5666419451bdd516f1f3f264d24a (patch) | |
| tree | e4197645da03dc3c7cc84e434cc31d0a0cca7056 /theories/NArith/Ndec.v | |
| parent | 420f78b2caeaaddc6fe484565b2d0e49c66888e5 (diff) | |
Imported Upstream version 8.5~beta1+dfsg
Diffstat (limited to 'theories/NArith/Ndec.v')
| -rw-r--r-- | theories/NArith/Ndec.v | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/theories/NArith/Ndec.v b/theories/NArith/Ndec.v index e38ce5ba..5b1815bd 100644 --- a/theories/NArith/Ndec.v +++ b/theories/NArith/Ndec.v @@ -1,6 +1,6 @@ (************************************************************************) (* v * The Coq Proof Assistant / The Coq Development Team *) -(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2014 *) +(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015 *) (* \VV/ **************************************************************) (* // * This file is distributed under the terms of the *) (* * GNU Lesser General Public License Version 2.1 *) @@ -119,11 +119,11 @@ Lemma Nneq_elim a a' : N.odd a = negb (N.odd a') \/ N.eqb (N.div2 a) (N.div2 a') = false. Proof. - intros. cut (N.odd a = N.odd a' \/ N.odd a = negb (N.odd a')). - intros. elim H0. intro. right. apply Ndiv2_bit_neq. assumption. - assumption. - intro. left. assumption. - case (N.odd a), (N.odd a'); auto. + intros. + enough (N.odd a = N.odd a' \/ N.odd a = negb (N.odd a')) as []. + - right. apply Ndiv2_bit_neq; assumption. + - left. assumption. + - case (N.odd a), (N.odd a'); auto. Qed. Lemma Ndouble_or_double_plus_un a : |