From 69f2ee3b34f1532193e804b1cea77c7542daea4c Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Wed, 18 Apr 2012 18:18:09 +0100
Subject: [PATCH] unique tips: add to list of invariants

---
 invariants.tex | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/invariants.tex b/invariants.tex
index 20d6e76..bc3813e 100644
--- a/invariants.tex
+++ b/invariants.tex
@@ -18,6 +18,9 @@ We maintain these each time we construct a new commit. \\
 \[\eqn{Coherence:}{
   \bigforall_{C,\p} C \haspatch \p \lor C \nothaspatch \p
 }\]
+\[\eqn{Unique Tips:}{
+  \bigforall_{C,\p} C \haspatch \p \implies \pendsof{C}{\p} = \{ T \}
+}\]
 \[\eqn{Foreign Inclusion:}{
   \bigforall_{D \text{ s.t. } \patchof{D} = \bot} D \isin C \equiv D \leq C
 }\]
-- 
2.30.2