text/ncat.tex
changeset 447 ba4f86b15ff0
parent 446 901a7c79976b
child 448 c3c8fb292934
equal deleted inserted replaced
446:901a7c79976b 447:ba4f86b15ff0
  1022 $a\in \psi_{\cC;W,c}(x)$ for some decomposition $x$, and $g: \psi_{\cC;W,c}(x)
  1022 $a\in \psi_{\cC;W,c}(x)$ for some decomposition $x$, and $g: \psi_{\cC;W,c}(x)
  1023 \to \psi_{\cC;W,c}(y)$ is value of $\psi_{\cC;W,c}$ on some antirefinement $x \leq y$.
  1023 \to \psi_{\cC;W,c}(y)$ is value of $\psi_{\cC;W,c}$ on some antirefinement $x \leq y$.
  1024 
  1024 
  1025 In the $A_\infty$ case, enriched over chain complexes, the concrete description of the homotopy colimit
  1025 In the $A_\infty$ case, enriched over chain complexes, the concrete description of the homotopy colimit
  1026 is more involved.
  1026 is more involved.
  1027 %\nn{should probably rewrite this to be compatible with some standard reference}
  1027 \nn{should change to less strange terminology: ``filtration" to ``simplex"
       
  1028 (search for all occurrences of ``filtration")}
  1028 Define an $m$-sequence in $W$ to be a sequence $x_0 \le x_1 \le \dots \le x_m$ of permissible decompositions of $W$.
  1029 Define an $m$-sequence in $W$ to be a sequence $x_0 \le x_1 \le \dots \le x_m$ of permissible decompositions of $W$.
  1029 Such sequences (for all $m$) form a simplicial set in $\cell(W)$.
  1030 Such sequences (for all $m$) form a simplicial set in $\cell(W)$.
  1030 Define $\cl{\cC}(W)$ as a vector space via
  1031 Define $\cl{\cC}(W)$ as a vector space via
  1031 \[
  1032 \[
  1032 	\cl{\cC}(W) = \bigoplus_{(x_i)} \psi_{\cC;W}(x_0)[m] ,
  1033 	\cl{\cC}(W) = \bigoplus_{(x_i)} \psi_{\cC;W}(x_0)[m] ,
  2171 	arc (90:135:3) node[circle,fill=black,inner sep=2pt] {}
  2172 	arc (90:135:3) node[circle,fill=black,inner sep=2pt] {}
  2172 	arc (-135:-90:3) node[below] {$A$}
  2173 	arc (-135:-90:3) node[below] {$A$}
  2173 	arc (-90:-45:3);
  2174 	arc (-90:-45:3);
  2174 \draw[fill]  (150:1.5) circle (2pt) node[below=4pt] {$D'$};
  2175 \draw[fill]  (150:1.5) circle (2pt) node[below=4pt] {$D'$};
  2175 \node[green!50!brown] at (-2,0) {\scalebox{2.0}{$f'\uparrow $}};
  2176 \node[green!50!brown] at (-2,0) {\scalebox{2.0}{$f'\uparrow $}};
  2176 \node[green!50!brown] at (0.2,0.8) {\scalebox{2.0}{$\psi^+\uparrow $}};
  2177 \node[green!50!brown] at (0.2,0.8) {\scalebox{2.0}{$\psi^\dagger \uparrow $}};
  2177 \end{tikzpicture}
  2178 \end{tikzpicture}
  2178 \end{equation*}
  2179 \end{equation*}
  2179 \caption{Moving $B$ from bottom to top}
  2180 \caption{Moving $B$ from bottom to top}
  2180 \label{jun23c}
  2181 \label{jun23c}
  2181 \end{figure}
  2182 \end{figure}