diff -r 8e62bd633a98 -r a5d75e0f9229 text/ncat.tex --- a/text/ncat.tex Mon Jul 19 12:26:59 2010 -0700 +++ b/text/ncat.tex Mon Jul 19 12:27:19 2010 -0700 @@ -821,8 +821,7 @@ This example will be used in Theorem \ref{thm:product} below, which allows us to compute the blob complex of a product. Notice that with $F$ a point, the above example is a construction turning a topological -$n$-category $\cC$ into an $A_\infty$ $n$-category which we'll denote by $\bc_*(\cC)$. -\nn{do we use this notation elsewhere (anymore)?} +$n$-category $\cC$ into an $A_\infty$ $n$-category. We think of this as providing a ``free resolution" of the topological $n$-category. \nn{say something about cofibrant replacements?} @@ -1025,8 +1024,6 @@ In the $A_\infty$ case, enriched over chain complexes, the concrete description of the homotopy colimit is more involved. -\nn{should change to less strange terminology: ``filtration" to ``simplex" -(search for all occurrences of ``filtration")} Define an $m$-sequence in $W$ to be a sequence $x_0 \le x_1 \le \dots \le x_m$ of permissible decompositions of $W$. Such sequences (for all $m$) form a simplicial set in $\cell(W)$. Define $\cl{\cC}(W)$ as a vector space via @@ -1034,9 +1031,6 @@ \cl{\cC}(W) = \bigoplus_{(x_i)} \psi_{\cC;W}(x_0)[m] , \] where the sum is over all $m$-sequences $(x_i)$ and all $m$, and each summand is degree shifted by $m$. -(Our homological conventions are non-standard: if a complex $U$ is concentrated in degree $0$, -the complex $U[m]$ is concentrated in degree $m$.) -\nn{if there is a std convention, should we use it? or are we deliberately bucking tradition?} We endow $\cl{\cC}(W)$ with a differential which is the sum of the differential of the $\psi_{\cC;W}(x_0)$ summands plus another term using the differential of the simplicial set of $m$-sequences. More specifically, if $(a, \bar{x})$ denotes an element in the $\bar{x}$ @@ -1051,14 +1045,13 @@ %combine only two balls at a time; for $n=1$ this version will lead to usual definition %of $A_\infty$ category} -We will call $m$ the filtration degree of the complex. -\nn{is there a more standard term for this?} +We will call $m$ the simplex degree of the complex. We can think of this construction as starting with a disjoint copy of a complex for each -permissible decomposition (filtration degree 0). +permissible decomposition (simplex degree 0). Then we glue these together with mapping cylinders coming from gluing maps -(filtration degree 1). +(simplex degree 1). Then we kill the extra homology we just introduced with mapping -cylinders between the mapping cylinders (filtration degree 2), and so on. +cylinders between the mapping cylinders (simplex degree 2), and so on. $\cl{\cC}(W)$ is functorial with respect to homeomorphisms of $k$-manifolds. Restricting the $k$-spheres, we have now proved Lemma \ref{lem:spheres}. @@ -2220,9 +2213,80 @@ across $B_1$ and $B_2$, say, with a single push across $B_1\cup B_2$. (See Figure \ref{jun23d}.) \begin{figure}[t] -\begin{equation*} -\mathfig{.9}{tempkw/jun23d} -\end{equation*} +\begin{tikzpicture} +\node(L) { +\scalebox{0.5}{ +\begin{tikzpicture}[baseline,line width = 1pt,x=1.5cm,y=1.5cm] +\draw[red] (0.75,0) -- +(2,0); +\draw[red] (0,0) node(R) {} + -- (0.75,0) node[below] {} + --(1.5,0) node[circle,fill=black,inner sep=2pt] {}; +\draw[fill] (150:1.5) circle (2pt) node[above=4pt] {}; +\draw (1.5,0) arc (0:149:1.5); +\draw[red] + (R) node[circle,fill=black,inner sep=2pt] {} + arc (-45:-135:3) node[circle,fill=black,inner sep=2pt] {}; +\draw[red] (-5.5,0) -- (-4.2,0); +\draw (R) arc (45:75:3); +\draw (150:1.5) arc (74:135:3); +\node at (-2,0) {\scalebox{2.0}{$B_1$}}; +\node at (0.2,0.8) {\scalebox{2.0}{$B_2$}}; +\node at (-4,1.2) {\scalebox{2.0}{$A$}}; +\node at (-4,-1.2) {\scalebox{2.0}{$C$}}; +\node[red] at (2.53,0.35) {\scalebox{2.0}{$E$}}; +\end{tikzpicture} +} +}; +\node(M) at (5,4) { +\scalebox{0.5}{ +\begin{tikzpicture}[baseline,line width = 1pt,x=1.5cm,y=1.5cm] +\draw[red] (0.75,0) -- +(2,0); +\draw[red] (0,0) node(R) {} + -- (0.75,0) node[below] {} + --(1.5,0) node[circle,fill=black,inner sep=2pt] {}; +\draw[fill] (150:1.5) circle (2pt) node[above=4pt] {}; +\draw(1.5,0) arc (0:149:1.5); +\draw + (R) node[circle,fill=black,inner sep=2pt] {} + arc (-45:-135:3) node[circle,fill=black,inner sep=2pt] {}; +\draw[red] (-5.5,0) -- (-4.2,0); +\draw[red] (R) arc (45:75:3); +\draw[red] (150:1.5) arc (74:135:3); +\node at (-2,0) {\scalebox{2.0}{$B_1$}}; +\node at (0.2,0.8) {\scalebox{2.0}{$B_2$}}; +\node at (-4,1.2) {\scalebox{2.0}{$A$}}; +\node at (-4,-1.2) {\scalebox{2.0}{$C$}}; +\node[red] at (2.53,0.35) {\scalebox{2.0}{$E$}}; +\end{tikzpicture} +} +}; +\node(R) at (10,0) { +\scalebox{0.5}{ +\begin{tikzpicture}[baseline,line width = 1pt,x=1.5cm,y=1.5cm] +\draw[red] (0.75,0) -- +(2,0); +\draw (0,0) node(R) {} + -- (0.75,0) node[below] {} + --(1.5,0) node[circle,fill=black,inner sep=2pt] {}; +\draw[fill] (150:1.5) circle (2pt) node[above=4pt] {}; +\draw[red] (1.5,0) arc (0:149:1.5); +\draw + (R) node[circle,fill=black,inner sep=2pt] {} + arc (-45:-135:3) node[circle,fill=black,inner sep=2pt] {}; +\draw[red] (-5.5,0) -- (-4.2,0); +\draw (R) arc (45:75:3); +\draw[red] (150:1.5) arc (74:135:3); +\node at (-2,0) {\scalebox{2.0}{$B_1$}}; +\node at (0.2,0.8) {\scalebox{2.0}{$B_2$}}; +\node at (-4,1.2) {\scalebox{2.0}{$A$}}; +\node at (-4,-1.2) {\scalebox{2.0}{$C$}}; +\node[red] at (2.53,0.35) {\scalebox{2.0}{$E$}}; +\end{tikzpicture} +} +}; +\draw[->] (L) to[out=90,in=225] node[sloped, above] {push $B_1$} (M); +\draw[->] (M) to[out=-45,in=90] node[sloped, above] {push $B_2$} (R); +\draw[->] (L) to[out=-35,in=-145] node[sloped, below] {push $B_1 \cup B_2$} (R); +\end{tikzpicture} \caption{A movie move} \label{jun23d} \end{figure}