From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Thu, 1 Mar 2012 00:49:39 +0000 (+0000)
Subject: pancs, pends
X-Git-Tag: f0.2~200
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?a=commitdiff_plain;h=2f33c411cfea9d651ed4c2ff75072d2fa5d04cdf;p=topbloke-formulae.git

pancs, pends
---

diff --git a/article.tex b/article.tex
index aac71af..e16ac24 100644
--- a/article.tex
+++ b/article.tex
@@ -77,6 +77,17 @@ 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.
 
+\item[ $ \pancs{C}{\set P} $ ]
+$ \{ A \; | \; A \le C \land A \in \set P \} $ 
+i.e. all the ancestors of $C$
+which are in $\set P$.
+
+\item[ $ \pends{C}{\set P} $ ]
+$ \{ E \; | \; E \in \pancs{C}{\set P}
+  \land \mathop{\not\exists}_{A \in \pancs{C}{\set P}}
+  A \neq E \land E \le A \} $ 
+i.e. all $\le$-maximal commits in $\pancs{C}{\set P}$.
+
 \end{basedescript}
 
 \section{Invariants}