dual module (non-)definition; other minor stuff
authorKevin Walker <kevin@canyon23.net>
Thu, 22 Jul 2010 16:16:58 -0600
changeset 476 4d0ca2fc4f2b
parent 475 07c18e2abd8f
child 477 86c8e2129355
dual module (non-)definition; other minor stuff
text/a_inf_blob.tex
text/ncat.tex
--- a/text/a_inf_blob.tex	Thu Jul 22 15:35:26 2010 -0600
+++ b/text/a_inf_blob.tex	Thu Jul 22 16:16:58 2010 -0600
@@ -69,7 +69,8 @@
 
 Let $G_*\sub \bc_*(Y\times F;C)$ be the subcomplex generated by blob diagrams $a$ such that there
 exists a decomposition $K$ of $Y$ such that $a$ splits along $K\times F$.
-It follows from Proposition \ref{thm:small-blobs} that $\bc_*(Y\times F; C)$ is homotopic to a subcomplex of $G_*$.
+It follows from Proposition \ref{thm:small-blobs} that $\bc_*(Y\times F; C)$ 
+is homotopic to a subcomplex of $G_*$.
 (If the blobs of $a$ are small with respect to a sufficiently fine cover then their
 projections to $Y$ are contained in some disjoint union of balls.)
 Note that the image of $\psi$ is equal to $G_*$.
@@ -95,7 +96,8 @@
 \end{lemma}
 
 \begin{proof}
-We will prove acyclicity in the first couple of degrees, and \nn{in this draft, at least}
+We will prove acyclicity in the first couple of degrees, and 
+%\nn{in this draft, at least}
 leave the general case to the reader.
 
 Let $K$ and $K'$ be two decompositions (0-simplices) of $Y$ compatible with $a$.
--- a/text/ncat.tex	Thu Jul 22 15:35:26 2010 -0600
+++ b/text/ncat.tex	Thu Jul 22 16:16:58 2010 -0600
@@ -1538,7 +1538,7 @@
 \[
 	(X_B\ot {_BY})^* \cong  \hom_B(X_B \to (_BY)^*) .
 \]
-We will establish the analogous isomorphism for a topological $A_\infty$ 1-cat $\cC$
+We would like to have the analogous isomorphism for a topological $A_\infty$ 1-cat $\cC$
 and modules $\cM_\cC$ and $_\cC\cN$,
 \[
 	(\cM_\cC\ot {_\cC\cN})^* \cong  \hom_\cC(\cM_\cC \to (_\cC\cN)^*) .
@@ -1547,7 +1547,8 @@
 In the next few paragraphs we define the objects appearing in the above equation:
 $\cM_\cC\ot {_\cC\cN}$, $(\cM_\cC\ot {_\cC\cN})^*$, $(_\cC\cN)^*$ and finally
 $\hom_\cC$.
-
+(Actually, we give only an incomplete definition of $(_\cC\cN)^*$, but since we are only trying to motivate the 
+definition of $\hom_\cC$, this will suffice for our purposes.)
 
 \def\olD{{\overline D}}
 \def\cbar{{\bar c}}
@@ -1597,7 +1598,7 @@
 			& \qquad	 + (-1)^{l + \deg m + \deg \cbar} f(\olD\ot m\ot\cbar\ot \bd n). \notag
 \end{align}
 
-Next we define the dual module $(_\cC\cN)^*$.
+Next we partially define the dual module $(_\cC\cN)^*$.
 This will depend on a choice of interval $J$, just as the tensor product did.
 Recall that $_\cC\cN$ is, among other things, a functor from right-marked intervals
 to chain complexes.
@@ -1607,9 +1608,17 @@
 \]
 where $({_\cC\cN}(J\setmin K))^*$ denotes the (linear) dual of the chain complex associated
 to the right-marked interval $J\setmin K$.
-This extends to a functor from all left-marked intervals (not just those contained in $J$).
-\nn{need to say more here; not obvious how homeomorphisms act}
-It's easy to verify the remaining module axioms.
+We define the action map
+\[
+	(_\cC\cN)^*(K) \ot \cC(I) \to (_\cC\cN)^*(K\cup I)
+\]
+to be the (partial) adjoint of the map
+\[
+	\cC(I)\ot {_\cC\cN}(J\setmin (K\cup I)) \to  {_\cC\cN}(J\setmin K) .
+\]
+This falls short of fully defining the module $(_\cC\cN)^*$ (in particular,
+we have no action of homeomorphisms of left-marked intervals), but it will be enough to motivate
+the definition of $\hom_\cC$ below.
 
 Now we reinterpret $(\cM_\cC\ot {_\cC\cN})^*$
 as some sort of morphism $\cM_\cC \to (_\cC\cN)^*$.
@@ -1772,10 +1781,10 @@
 \medskip
 
 
-\nn{should we define functors between $n$-cats in a similar way?  i.e.\ natural transformations
-of the $\cC$ functors which commute with gluing only up to higher morphisms?
-perhaps worth having both definitions available.
-certainly the simple kind (strictly commute with gluing) arise in nature.}
+%\nn{should we define functors between $n$-cats in a similar way?  i.e.\ natural transformations
+%of the $\cC$ functors which commute with gluing only up to higher morphisms?
+%perhaps worth having both definitions available.
+%certainly the simple kind (strictly commute with gluing) arise in nature.}