X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?a=blobdiff_plain;f=invariants.tex;h=0cac868d3e6b8aaf7de01d375a4a28c8b229d77c;hb=cc2806a584319dd6210fb8a89d342d1110d8dc67;hp=20d6e7644f76148d3c9790b31b55a47e8489fa35;hpb=891ae7626916bde1eb7dfa38762bbb4d94b85211;p=topbloke-formulae.git

diff --git a/invariants.tex b/invariants.tex
index 20d6e76..0cac868 100644
--- a/invariants.tex
+++ b/invariants.tex
@@ -1,27 +1,30 @@
 \section{Invariants}
 
 We maintain these each time we construct a new commit. \\
-\[ \eqn{No Replay:}{
+\[ \eqn{No Replay}{
   C \has D \implies C \ge D
 }\]
-\[\eqn{Unique Base:}{
+\[\eqn{Unique Base}{
  \bigforall_{C \in \py} \pendsof{C}{\pn} = \{ B \}
 }\]
-\[\eqn{Tip Contents:}{
+\[\eqn{Tip Contents}{
   \bigforall_{C \in \py} D \isin C \equiv
     { D \isin \baseof{C} \lor \atop
       (D \in \py \land D \le C) }
 }\]
-\[\eqn{Base Acyclic:}{
+\[\eqn{Base Acyclic}{
   \bigforall_{C \in \pn} D \isin C \implies D \notin \py
 }\]
-\[\eqn{Coherence:}{
+\[\eqn{Coherence}{
   \bigforall_{C,\p} C \haspatch \p \lor C \nothaspatch \p
 }\]
-\[\eqn{Foreign Inclusion:}{
+\[\eqn{Unique Tips}{
+  \bigforall_{C,\p} C \haspatch \p \implies \pendsof{C}{\py} = \{ T \}
+}\]
+\[\eqn{Foreign Inclusion}{
   \bigforall_{D \text{ s.t. } \patchof{D} = \bot} D \isin C \equiv D \leq C
 }\]
-\[\eqn{Foreign Contents:}{
+\[\eqn{Foreign Contents}{
   \bigforall_{C \text{ s.t. } \patchof{C} = \bot}
     D \le C \implies \patchof{D} = \bot
 }\]