diff -r a20e2318cbb0 -r 0bfcb02658ce text/a_inf_blob.tex --- a/text/a_inf_blob.tex Wed Jun 02 22:09:52 2010 -0700 +++ b/text/a_inf_blob.tex Wed Jun 02 22:28:04 2010 -0700 @@ -357,12 +357,15 @@ \end{thm} \begin{rem} \nn{This just isn't true, Lurie doesn't do this! I just heard this from Ricardo...} +\nn{KW: Are you sure about that?} Lurie has shown in \cite{0911.0018} that the topological chiral homology of an $n$-manifold $M$ with coefficients in \nn{a certain $E_n$ algebra constructed from $T$} recovers the same space of singular chains on maps from $M$ to $T$, with the additional hypothesis that $T$ is $n-1$-connected. This extra hypothesis is not surprising, in view of the idea that an $E_n$ algebra is roughly equivalent data as an $A_\infty$ $n$-category which is trivial at all but the topmost level. \end{rem} +\nn{proof is again similar to that of Theorem \ref{product_thm}. should probably say that explicitly} + \begin{proof} We begin by constructing chain map $g: \cB^\cT(M) \to C_*(\Maps(M\to T))$. -We then use \ref{extension_lemma_b} to show that $g$ induces isomorphisms on homology. +We then use Lemma \ref{extension_lemma_c} to show that $g$ induces isomorphisms on homology. Recall that the homotopy colimit $\cB^\cT(M)$ is constructed out of a series of $j$-fold mapping cylinders, $j \ge 0$. @@ -392,42 +395,12 @@ It is not hard to see that this defines a chain map from $\cB^\cT(M)$ to $C_*(\Maps(M\to T))$. - -%%%%%%%%%%%%%%%%% -\noop{ -Next we show that $g$ induces a surjection on homology. -Fix $k > 0$ and choose an open cover $\cU$ of $M$ fine enough so that the union -of any $k$ open sets of $\cU$ is contained in a disjoint union of balls in $M$. -\nn{maybe should refer to elsewhere in this paper where we made a very similar argument} -Let $S_*$ be the subcomplex of $C_*(\Maps(M\to T))$ generated by chains adapted to $\cU$. -It follows from Lemma \ref{extension_lemma_b} that $C_*(\Maps(M\to T))$ -retracts onto $S_*$. - -Let $S_{\le k}$ denote the chains of $S_*$ of degree less than or equal to $k$. -We claim that $S_{\le k}$ lies in the image of $g$. -Let $c$ be a generator of $S_{\le k}$ --- that is, a $j$-parameter family of maps $M\to T$, -$j \le k$. -We chose $\cU$ fine enough so that the support of $c$ is contained in a disjoint union of balls -in $M$. -It follow that we can choose a decomposition $K$ of $M$ so that the support of $c$ is -disjoint from the $n{-}1$-skeleton of $K$. -It is now easy to see that $c$ is in the image of $g$. - -Next we show that $g$ is injective on homology. -} - - - \nn{...} - - \end{proof} \nn{maybe should also mention version where we enrich over -spaces rather than chain complexes; should comment on Lurie's \cite{0911.0018} (and others') similar result -for the $E_\infty$ case, and mention that our version does not require -any connectivity assumptions} +spaces rather than chain complexes;} \medskip \hrule @@ -435,7 +408,7 @@ \nn{to be continued...} \medskip -\nn{still to do: fiber bundles, general maps} +\nn{still to do: general maps} \todo{} Various citations we might want to make: @@ -446,21 +419,4 @@ \item \cite{MR1256989} definition of framed little-discs operad \end{itemize} -We now turn to establishing the gluing formula for blob homology, restated from Property \ref{property:gluing} in the Introduction -\begin{itemize} -%\mbox{}% <-- gets the indenting right -\item For any $(n-1)$-manifold $Y$, the blob homology of $Y \times I$ is -naturally an $A_\infty$ category. % We'll write $\bc_*(Y)$ for $\bc_*(Y \times I)$ below. -\item For any $n$-manifold $X$, with $Y$ a codimension $0$-submanifold of its boundary, the blob homology of $X$ is naturally an -$A_\infty$ module for $\bc_*(Y \times I)$. - -\item For any $n$-manifold $X$, with $Y \cup Y^{\text{op}}$ a codimension -$0$-submanifold of its boundary, the blob homology of $X'$, obtained from -$X$ by gluing along $Y$, is the $A_\infty$ self-tensor product of -$\bc_*(X)$ as an $\bc_*(Y \times I)$-bimodule. -\begin{equation*} -\bc_*(X') \iso \bc_*(X) \Tensor^{A_\infty}_{\mathclap{\bc_*(Y \times I)}} \!\!\!\!\!\!\xymatrix{ \ar@(ru,rd)@<-1ex>[]} -\end{equation*} -\end{itemize} -