From 79421f72f0cdcadc7e329bc8a597588a9de90506 Mon Sep 17 00:00:00 2001
From: Robbert Krebbers <mail@robbertkrebbers.nl>
Date: Mon, 15 Feb 2016 20:49:06 +0100
Subject: [PATCH] Anti symmetry for sets.

---
 theories/collections.v | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/theories/collections.v b/theories/collections.v
index f3ed2dd9..5e0a304b 100644
--- a/theories/collections.v
+++ b/theories/collections.v
@@ -24,6 +24,8 @@ Section simple_collection.
   Proof. firstorder auto. Qed.
   Global Instance: JoinSemiLattice C.
   Proof. firstorder auto. Qed.
+  Global Instance: AntiSymm (≡) (@collection_subseteq A C _).
+  Proof. done. Qed.
   Lemma elem_of_subseteq X Y : X ⊆ Y ↔ ∀ x, x ∈ X → x ∈ Y.
   Proof. done. Qed.
   Lemma elem_of_equiv X Y : X ≡ Y ↔ ∀ x, x ∈ X ↔ x ∈ Y.
-- 
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