diff -r c876013ea42e -r 1c898c2d0ebd text/a_inf_blob.tex --- a/text/a_inf_blob.tex Tue Jun 01 17:26:28 2010 -0700 +++ b/text/a_inf_blob.tex Tue Jun 01 20:44:54 2010 -0700 @@ -15,9 +15,17 @@ \medskip -\subsection{The small blob complex} +An important technical tool in the proofs of this section is provided by the idea of `small blobs'. +Fix $\cU$, an open cover of $M$. Define the `small blob complex' $\bc^{\cU}_*(M)$ to be the subcomplex of $\bc_*(M)$ of all blob diagrams in which every blob is contained in some open set of $\cU$. +\nn{KW: We need something a little stronger: Every blob diagram (even a 0-blob diagram) is splittable into pieces which are small w.r.t.\ $\cU$. +If field have potentially large coupons/boxes, then this is a non-trivial constraint. +On the other hand, we could probably get away with ignoring this point. +Maybe the exposition will be better if we sweep this technical detail under the rug?} -\input{text/smallblobs} +\begin{thm}[Small blobs] \label{thm:small-blobs} +The inclusion $i: \bc^{\cU}_*(M) \into \bc_*(M)$ is a homotopy equivalence. +\end{thm} +The proof appears in \S \ref{appendix:small-blobs}. \subsection{A product formula} \label{ss:product-formula}