X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=topbloke-formulae.git;a=blobdiff_plain;f=notation.tex;h=6eb2e80d947a8bd1cb7d960bd43738ebbd352d8c;hp=413305fd86341add556b5d0eec37265e0dab4919;hb=16c8cf55a226dcb5cd8ee0e7ba2b0f3d16ab39d0;hpb=ab5ce6ebd6f3fa445d336f659a6861205ef2564c

diff --git a/notation.tex b/notation.tex
index 413305f..6eb2e80 100644
--- a/notation.tex
+++ b/notation.tex
@@ -1,5 +1,8 @@
 \section{Notation}
 
+Throughout, any free variables are implicitly universally quantified
+at the outermost level.
+
 \begin{basedescript}{
 \desclabelwidth{5em}
 \desclabelstyle{\nextlinelabel}
@@ -27,7 +30,12 @@ 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 of these sets are disjoint.  Hence:
+All of these sets will be disjoint by construction
+(see Invariants, below).  Hence:
+
+\item[ $\set A$, $\set P$, $\ldots$ ]
+Arbitrary sets of commits.  Maybe $\set P = \p$ i.e.\ some $\py$ or $\pn$, but
+maybe not.
 
 \item[ $ \patchof{ C } $ ]
 Either $\p$ s.t. $ C \in \p $, or $\bot$.