# HG changeset patch # User Kevin Walker # Date 1323484991 28800 # Node ID 341c2a09f9a8be937b14ab2665d3341d84769449 # Parent 0bf2002737f09edcec6ac6d73116d01459867848 mostly minor edits -- section 6.1 diff -r 0bf2002737f0 -r 341c2a09f9a8 text/ncat.tex --- a/text/ncat.tex Fri Dec 09 17:01:53 2011 -0800 +++ b/text/ncat.tex Fri Dec 09 18:43:11 2011 -0800 @@ -57,14 +57,16 @@ Still other definitions (see, for example, \cite{MR2094071}) model the $k$-morphisms on more complicated combinatorial polyhedra. -For our definition, we will allow our $k$-morphisms to have any shape, so long as it is +For our definition, we will allow our $k$-morphisms to have {\it any} shape, so long as it is homeomorphic to the standard $k$-ball. Thus we associate a set of $k$-morphisms $\cC_k(X)$ to any $k$-manifold $X$ homeomorphic to the standard $k$-ball. -By ``a $k$-ball" we mean any $k$-manifold which is homeomorphic to the + +Below, we will use ``a $k$-ball" to mean any $k$-manifold which is homeomorphic to the standard $k$-ball. -We {\it do not} assume that it is equipped with a -preferred homeomorphism to the standard $k$-ball, and the same applies to ``a $k$-sphere" below. +We {\it do not} assume that such $k$-balls are equipped with a +preferred homeomorphism to the standard $k$-ball. +The same applies to ``a $k$-sphere" below. Given a homeomorphism $f:X\to Y$ between $k$-balls (not necessarily fixed on the boundary), we want a corresponding @@ -240,8 +242,9 @@ .$$ These restriction maps can be thought of as domain and range maps, relative to the choice of splitting $\bd X = B_1 \cup_E B_2$. -These restriction maps in fact have their image in the subset $\cC(B_i)\trans E$, -and so to emphasize this we will sometimes write the restriction map as $\cC(X)\trans E \to \cC(B_i)\trans E$. +%%%% the next sentence makes no sense to me, even though I'm probably the one who wrote it -- KW +\noop{These restriction maps in fact have their image in the subset $\cC(B_i)\trans E$, +and so to emphasize this we will sometimes write the restriction map as $\cC(X)\trans E \to \cC(B_i)\trans E$.} Next we consider composition of morphisms. @@ -409,7 +412,7 @@ The need for a strengthened version will become apparent in Appendix \ref{sec:comparing-defs} where we construct a traditional 2-category from a disk-like 2-category. For example, ``half-pinched" products of 1-balls are used to construct weak identities for 1-morphisms -in 2-categories. +in 2-categories (see \S\ref{ssec:2-cats}). We also need fully-pinched products to define collar maps below (see Figure \ref{glue-collar}). Define a {\it pinched product} to be a map