diff options
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] *) |