diff -r 5bb1cbe49c40 -r ef8fac44a8aa text/tqftreview.tex --- a/text/tqftreview.tex Mon May 31 17:27:17 2010 -0700 +++ b/text/tqftreview.tex Mon May 31 23:42:37 2010 -0700 @@ -30,14 +30,20 @@ Before finishing the definition of fields, we give two motivating examples (actually, families of examples) of systems of fields. -The first examples: Fix a target space $B$, and let $\cC(X)$ be the set of continuous maps +\begin{example} +\label{ex:maps-to-a-space(fields)} +Fix a target space $B$, and let $\cC(X)$ be the set of continuous maps from X to $B$. +\end{example} -The second examples: Fix an $n$-category $C$, and let $\cC(X)$ be +\begin{example} +\label{ex:traditional-n-categories(fields)} +Fix an $n$-category $C$, and let $\cC(X)$ be the set of sub-cell-complexes of $X$ with codimension-$j$ cells labeled by $j$-morphisms of $C$. One can think of such sub-cell-complexes as dual to pasting diagrams for $C$. This is described in more detail below. +\end{example} Now for the rest of the definition of system of fields. \begin{enumerate} @@ -262,8 +268,23 @@ \subsection{Local relations} \label{sec:local-relations} +Local relations are certain subspaces of the fields on balls, which form an ideal under gluing. Again, we give the examples first. +\addtocounter{prop}{-2} +\begin{example}[contd.] +For maps into spaces, $U(B; c)$ is generated by fields of the form $a-b \in \lf(B; c)$, +where $a$ and $b$ are maps (fields) which are homotopic rel boundary. +\end{example} +\begin{example}[contd.] +For $n$-category pictures, $U(B; c)$ is equal to the kernel of the evaluation map +$\lf(B; c) \to \mor(c', c'')$, where $(c', c'')$ is some (any) division of $c$ into +domain and range. +\end{example} + +These motivate the following definition. + +\begin{defn} A {\it local relation} is a collection subspaces $U(B; c) \sub \lf(B; c)$, for all $n$-manifolds $B$ which are homeomorphic to the standard $n$-ball and all $c \in \cC(\bd B)$, @@ -277,17 +298,9 @@ \item ideal with respect to gluing: if $B = B' \cup B''$, $x\in U(B')$, and $c\in \cC(B'')$, then $x\bullet r \in U(B)$ \end{enumerate} -See \cite{kw:tqft} for details. - - -For maps into spaces, $U(B; c)$ is generated by things of the form $a-b \in \lf(B; c)$, -where $a$ and $b$ are maps (fields) which are homotopic rel boundary. +\end{defn} +See \cite{kw:tqft} for further details. -For $n$-category pictures, $U(B; c)$ is equal to the kernel of the evaluation map -$\lf(B; c) \to \mor(c', c'')$, where $(c', c'')$ is some (any) division of $c$ into -domain and range. - -\nn{maybe examples of local relations before general def?} \subsection{Constructing a TQFT} \label{sec:constructing-a-tqft}