From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Thu, 1 Mar 2012 00:59:36 +0000 (+0000)
Subject: patchof
X-Git-Tag: f0.2~197
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?a=commitdiff_plain;h=57b232d4acbec7ef364c74fbc450121530f37226;p=topbloke-formulae.git

patchof
---

diff --git a/article.tex b/article.tex
index 28bc714..3538cc8 100644
--- a/article.tex
+++ b/article.tex
@@ -38,6 +38,8 @@
 \newcommand{\pancs}[2]{{\mathcal A} ( #1 , #2 ) }
 \newcommand{\pends}[2]{{\mathcal E} ( #1 , #2 ) }
 
+\newcommand{\patchof}[1]{{\mathcal P} ( #1 ) }
+
 \renewcommand{\land}{\wedge}
 
 \begin{document}
@@ -71,7 +73,11 @@ A patch $\p$ consists of two sets of commits $\pn$ and $\py$, which
 are respectively the base and tip git branches.  $\p$ may be used
 where the context requires a set, in which case the statement
 is to be taken as applying to both $\py$ and $\pn$.
-All these sets are distinct.
+All these sets are distinct.  Hence:
+
+\item[ $ \patchof{ C } $ ]
+Either $\p$ s.t. $ C \in \p $, or $\bot$.  
+A function from commits to sets $\p$.
 
 \item[ $ \pancs{C}{\set P} $ ]
 $ \{ A \; | \; A \le C \land A \in \set P \} $