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| author |  letouzey <letouzey@85f007b7-540e-0410-9357-904b9bb8a0f7> | 2009-09-09 16:10:59 +0000 |
|---|---|---|
| committer | letouzey <letouzey@85f007b7-540e-0410-9357-904b9bb8a0f7> | 2009-09-09 16:10:59 +0000 |
| commit | 8907c227f5c456f14617890946aa808ef522d7da (patch) | |
| tree | f8b9abbfb9f1713642fe5bf48d5ead64e4a5510c /theories/Bool | |
| parent | e1723b1094719c1a60fddaa2668151b4f8ebc9ea (diff) | |
Znumtheory + Zdiv enriched with stuff from ZMicromega, misc improvements
Mostly results about Zgcd (commutativity, associativity, ...).
Slight improvement of ZMicromega.
Beware: some lemmas of Zdiv/ Znumtheory were asking for
too strict or useless hypothesis. Some minor glitches may occur.
By the way, some iff lemmas about negb in Bool.v
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@12313 85f007b7-540e-0410-9357-904b9bb8a0f7
Diffstat (limited to 'theories/Bool')
| -rw-r--r-- | theories/Bool/Bool.v | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/theories/Bool/Bool.v b/theories/Bool/Bool.v index 2995f0515..dcb10f3cf 100644 --- a/theories/Bool/Bool.v +++ b/theories/Bool/Bool.v @@ -202,6 +202,16 @@ Proof. destruct b; trivial. Qed. +Lemma negb_true_iff : forall b, negb b = true <-> b = false. +Proof. + destruct b; intuition. +Qed. + +Lemma negb_false_iff : forall b, negb b = false <-> b = true. +Proof. + destruct b; intuition. +Qed. + (********************************) (** * Properties of [orb] *) |