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34 submanifold of $X$, then $X \setmin Y$ implicitly means the closure |
34 submanifold of $X$, then $X \setmin Y$ implicitly means the closure |
35 $\overline{X \setmin Y}$. |
35 $\overline{X \setmin Y}$. |
36 |
36 |
37 |
37 |
38 \subsection{Systems of fields} |
38 \subsection{Systems of fields} |
|
39 \label{ss:syst-o-fields} |
39 |
40 |
40 Let $\cM_k$ denote the category with objects |
41 Let $\cM_k$ denote the category with objects |
41 unoriented PL manifolds of dimension |
42 unoriented PL manifolds of dimension |
42 $k$ and morphisms homeomorphisms. |
43 $k$ and morphisms homeomorphisms. |
43 (We could equally well work with a different category of manifolds --- |
44 (We could equally well work with a different category of manifolds --- |