text/ncat.tex
changeset 915 e8e234aeb266
parent 914 db365e67adf6
child 916 7d398420577d
equal deleted inserted replaced
914:db365e67adf6 915:e8e234aeb266
  1840 The proof is exactly analogous to that of Lemma \ref{lem:spheres}, and we omit the details.
  1840 The proof is exactly analogous to that of Lemma \ref{lem:spheres}, and we omit the details.
  1841 We use the same type of colimit construction.
  1841 We use the same type of colimit construction.
  1842 
  1842 
  1843 In our example, $\cl\cM(H) = \cD(H\times\bd W \cup \bd H\times W)$.
  1843 In our example, $\cl\cM(H) = \cD(H\times\bd W \cup \bd H\times W)$.
  1844 
  1844 
  1845 \begin{module-axiom}[Module boundaries (maps)]
  1845 \begin{module-axiom}[Module boundaries]
  1846 {For each marked $k$-ball $M$ we have a map of sets $\bd: \cM(M)\to \cl\cM(\bd M)$.
  1846 {For each marked $k$-ball $M$ we have a map of sets $\bd: \cM(M)\to \cl\cM(\bd M)$.
  1847 These maps, for various $M$, comprise a natural transformation of functors.}
  1847 These maps, for various $M$, comprise a natural transformation of functors.}
  1848 \end{module-axiom}
  1848 \end{module-axiom}
  1849 
  1849 
  1850 Given $c\in\cl\cM(\bd M)$, let $\cM(M; c) \deq \bd^{-1}(c)$.
  1850 Given $c\in\cl\cM(\bd M)$, let $\cM(M; c) \deq \bd^{-1}(c)$.
  1948 \[
  1948 \[
  1949 	\gl_Y : \cM(M_1) \trans E \times_{\cM(Y)} \cM(M_2) \trans E \to \cM(M) \trans E
  1949 	\gl_Y : \cM(M_1) \trans E \times_{\cM(Y)} \cM(M_2) \trans E \to \cM(M) \trans E
  1950 \]
  1950 \]
  1951 which is natural with respect to the actions of homeomorphisms, and also compatible with restrictions
  1951 which is natural with respect to the actions of homeomorphisms, and also compatible with restrictions
  1952 to the intersection of the boundaries of $M$ and $M_i$.
  1952 to the intersection of the boundaries of $M$ and $M_i$.
  1953 If $k < n$,
  1953 If $k < n$ we require that $\gl_Y$ is injective.}
  1954 or if $k=n$ and we are in the $A_\infty$ case, 
       
  1955 we require that $\gl_Y$ is injective.
       
  1956 (For $k=n$ in the ordinary (non-$A_\infty$) case, see below.)}
       
  1957 \end{module-axiom}
  1954 \end{module-axiom}
  1958 
  1955 
  1959 
  1956 
  1960 Second, we can compose an $n$-category morphism with a module morphism to get another
  1957 Second, we can compose an $n$-category morphism with a module morphism to get another
  1961 module morphism.
  1958 module morphism.
  1972 \[
  1969 \[
  1973 	\gl_Y :\cC(X)\trans E \times_{\cC(Y)} \cM(M')\trans E \to \cM(M) \trans E
  1970 	\gl_Y :\cC(X)\trans E \times_{\cC(Y)} \cM(M')\trans E \to \cM(M) \trans E
  1974 \]
  1971 \]
  1975 which is natural with respect to the actions of homeomorphisms, and also compatible with restrictions
  1972 which is natural with respect to the actions of homeomorphisms, and also compatible with restrictions
  1976 to the intersection of the boundaries of $X$ and $M'$.
  1973 to the intersection of the boundaries of $X$ and $M'$.
  1977 If $k < n$,
  1974 If $k < n$ we require that $\gl_Y$ is injective.}
  1978 or if $k=n$ and we are in the $A_\infty$ case, 
       
  1979 we require that $\gl_Y$ is injective.
       
  1980 (For $k=n$ in the ordinary (non-$A_\infty$) case, see below.)}
       
  1981 \end{module-axiom}
  1975 \end{module-axiom}
  1982 
  1976 
  1983 \begin{module-axiom}[Strict associativity]
  1977 \begin{module-axiom}[Strict associativity]
  1984 The composition and action maps above are strictly associative.
  1978 The composition and action maps above are strictly associative.
  1985 Given any decomposition of a large marked ball into smaller marked and unmarked balls
  1979 Given any decomposition of a large marked ball into smaller marked and unmarked balls