diff options
Diffstat (limited to 'theories/FSets/FSetWeakFacts.v')
| -rw-r--r-- | theories/FSets/FSetWeakFacts.v | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/theories/FSets/FSetWeakFacts.v b/theories/FSets/FSetWeakFacts.v index 46a73cc9..61797a95 100644 --- a/theories/FSets/FSetWeakFacts.v +++ b/theories/FSets/FSetWeakFacts.v @@ -6,7 +6,7 @@ (* * GNU Lesser General Public License Version 2.1 *) (***********************************************************************) -(* $Id: FSetWeakFacts.v 8681 2006-04-05 11:56:14Z letouzey $ *) +(* $Id: FSetWeakFacts.v 8882 2006-05-31 21:55:30Z letouzey $ *) (** * Finite sets library *) @@ -159,6 +159,12 @@ generalize (mem_iff s x) (mem_iff s y)(In_eq_iff s H). destruct (mem x s); destruct (mem y s); intuition. Qed. +Lemma empty_b : mem y empty = false. +Proof. +generalize (empty_iff y)(mem_iff empty y). +destruct (mem y empty); intuition. +Qed. + Lemma add_b : mem y (add x s) = eqb x y || mem y s. Proof. generalize (mem_iff (add x s) y)(mem_iff s y)(add_iff s x y); unfold eqb. |