diff -r 32e75ba211cd -r cf01e213044a text/hochschild.tex --- a/text/hochschild.tex Thu Apr 01 15:39:33 2010 -0700 +++ b/text/hochschild.tex Tue Apr 06 08:43:37 2010 -0700 @@ -467,9 +467,6 @@ \label{fig:hochschild-1-chains} \end{figure} -In degree 2, we send $m\ot a \ot b$ to the sum of 24 ($=6\cdot4$) 2-blob diagrams as shown in -Figure \ref{fig:hochschild-2-chains}. In Figure \ref{fig:hochschild-2-chains} the 1- and 2-blob diagrams are indicated only by their support. -We leave it to the reader to determine the labels of the 1-blob diagrams. \begin{figure}[!ht] \begin{equation*} \mathfig{0.6}{hochschild/2-chains-0} @@ -480,15 +477,6 @@ \caption{The 0-, 1- and 2-chains in the image of $m \tensor a \tensor b$. Only the supports of the 1- and 2-blobs are shown.} \label{fig:hochschild-2-chains} \end{figure} -Each 2-cell in the figure is labeled by a ball $V$ in $S^1$ which contains the support of all -1-blob diagrams in its boundary. -Such a 2-cell corresponds to a sum of the 2-blob diagrams obtained by adding $V$ -as an outer (non-twig) blob to each of the 1-blob diagrams in the boundary of the 2-cell. -Figure \ref{fig:hochschild-example-2-cell} shows this explicitly for the 2-cell -labeled $A$ in Figure \ref{fig:hochschild-2-chains}. -Note that the (blob complex) boundary of this sum of 2-blob diagrams is -precisely the sum of the 1-blob diagrams corresponding to the boundary of the 2-cell. -(Compare with the proof of \ref{bcontract}.) \begin{figure}[!ht] \begin{equation*} @@ -501,3 +489,16 @@ \caption{One of the 2-cells from Figure \ref{fig:hochschild-2-chains}.} \label{fig:hochschild-example-2-cell} \end{figure} + +In degree 2, we send $m\ot a \ot b$ to the sum of 24 ($=6\cdot4$) 2-blob diagrams as shown in +Figure \ref{fig:hochschild-2-chains}. In Figure \ref{fig:hochschild-2-chains} the 1- and 2-blob diagrams are indicated only by their support. +We leave it to the reader to determine the labels of the 1-blob diagrams. +Each 2-cell in the figure is labeled by a ball $V$ in $S^1$ which contains the support of all +1-blob diagrams in its boundary. +Such a 2-cell corresponds to a sum of the 2-blob diagrams obtained by adding $V$ +as an outer (non-twig) blob to each of the 1-blob diagrams in the boundary of the 2-cell. +Figure \ref{fig:hochschild-example-2-cell} shows this explicitly for the 2-cell +labeled $A$ in Figure \ref{fig:hochschild-2-chains}. +Note that the (blob complex) boundary of this sum of 2-blob diagrams is +precisely the sum of the 1-blob diagrams corresponding to the boundary of the 2-cell. +(Compare with the proof of \ref{bcontract}.)