diff -r 9ca95f2627f8 -r 0b5c9bc25191 text/intro.tex --- a/text/intro.tex Wed Sep 15 11:27:12 2010 -0700 +++ b/text/intro.tex Wed Sep 15 13:33:47 2010 -0500 @@ -3,7 +3,7 @@ \section{Introduction} We construct a chain complex $\bc_*(M; \cC)$ --- the ``blob complex'' --- -associated to an $n$-manifold $M$ and a linear $n$-category with strong duality $\cC$. +associated to an $n$-manifold $M$ and a linear $n$-category $\cC$ with strong duality. This blob complex provides a simultaneous generalization of several well known constructions: \begin{itemize} \item The 0-th homology $H_0(\bc_*(M; \cC))$ is isomorphic to the usual @@ -124,7 +124,7 @@ } (FU.100); \draw[->] (C) -- node[above left=3pt] {restrict to \\ standard balls} (tC); \draw[->] (FU.80) -- node[right] {restrict \\ to balls} (C.-80); -\draw[->] (BC) -- node[left] {$H_0$} node[right] {c.f. Theorem \ref{thm:skein-modules}} (A); +\draw[->] (BC) -- node[right] {$H_0$ \\ c.f. Theorem \ref{thm:skein-modules}} (A); \draw[->] (FU) -- node[left] {blob complex \\ for balls} (Cs); \draw[<->] (BC) -- node[right] {$\iso$ by \\ Corollary \ref{cor:new-old}} (BCs); @@ -367,17 +367,14 @@ for any homeomorphic pair $X$ and $Y$, satisfying corresponding conditions. -\nn{KW: the next paragraph seems awkward to me} - -\nn{KW: also, I'm not convinced that all of these (above and below) should be called theorems} +In \S \ref{sec:ncats} we introduce the notion of topological $n$-categories, from which we can construct systems of fields. +Below, when we talk about the blob complex for a topological $n$-category, we are implicitly passing first to this associated system of fields. +Further, in \S \ref{sec:ncats} we also have the notion of an $A_\infty$ $n$-category. In that section we describe how to use the blob complex to construct $A_\infty$ $n$-categories from topological $n$-categories: -In \S \ref{sec:ncats} we introduce the notion of topological $n$-categories, from which we can construct systems of fields. -Below, we talk about the blob complex associated to a topological $n$-category, implicitly passing first to the system of fields. -Further, in \S \ref{sec:ncats} we also have the notion of an $A_\infty$ $n$-category. +\newtheorem*{ex:blob-complexes-of-balls}{Example \ref{ex:blob-complexes-of-balls}} -\todo{Give this a number inside the text} -\begin{thm}[Blob complexes of products with balls form an $A_\infty$ $n$-category] -\label{thm:blobs-ainfty} +\begin{ex:blob-complexes-of-balls}[Blob complexes of products with balls form an $A_\infty$ $n$-category] +%\label{thm:blobs-ainfty} Let $\cC$ be a topological $n$-category. Let $Y$ be an $n{-}k$-manifold. There is an $A_\infty$ $k$-category $\bc_*(Y;\cC)$, defined on each $m$-ball $D$, for $0 \leq m < k$, @@ -386,17 +383,15 @@ (When $m=k$ the subsets with fixed boundary conditions form a chain complex.) These sets have the structure of an $A_\infty$ $k$-category, with compositions coming from the gluing map in Property \ref{property:gluing-map} and with the action of families of homeomorphisms given in Theorem \ref{thm:evaluation}. -\end{thm} +\end{ex:blob-complexes-of-balls} \begin{rem} Perhaps the most interesting case is when $Y$ is just a point; then we have a way of building an $A_\infty$ $n$-category from a topological $n$-category. We think of this $A_\infty$ $n$-category as a free resolution. \end{rem} -Theorem \ref{thm:blobs-ainfty} appears as Example \ref{ex:blob-complexes-of-balls} in \S \ref{sec:ncats}. - There is a version of the blob complex for $\cC$ an $A_\infty$ $n$-category instead of a topological $n$-category; this is described in \S \ref{sec:ainfblob}. -The definition is in fact simpler, almost tautological, and we use a different notation, $\cl{\cC}(M)$. +The definition is in fact simpler, almost tautological, and we use a different notation, $\cl{\cC}(M)$. The next theorem describes the blob complex for product manifolds, in terms of the $A_\infty$ blob complex of the $A_\infty$ $n$-categories constructed as in the previous example. %The notation is intended to reflect the close parallel with the definition of the TQFT skein module via a colimit. \newtheorem*{thm:product}{Theorem \ref{thm:product}} @@ -404,7 +399,7 @@ \begin{thm:product}[Product formula] Let $W$ be a $k$-manifold and $Y$ be an $n-k$ manifold. Let $\cC$ be an $n$-category. -Let $\bc_*(Y;\cC)$ be the $A_\infty$ $k$-category associated to $Y$ via blob homology (see Theorem \ref{thm:blobs-ainfty}). +Let $\bc_*(Y;\cC)$ be the $A_\infty$ $k$-category associated to $Y$ via blob homology (see Example \ref{ex:blob-complexes-of-balls}). Then \[ \bc_*(Y\times W; \cC) \simeq \cl{\bc_*(Y;\cC)}(W).