Talk:Normal bordism - definitions (Ex)
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# There exists a compact manifold $W$ of dimension $n+1$ whose boundary can be written as $\partial W=\partial_0W\amalg\partial_1W$. | # There exists a compact manifold $W$ of dimension $n+1$ whose boundary can be written as $\partial W=\partial_0W\amalg\partial_1W$. | ||
− | # There exists a vector bundle $\eta$: $E'\to X\times[0,1]$ and there exist $b\in\mathbb{N}_0$ and a bundle map $(F,\overline{F})$: $TW\oplus\underline{\mathbb{R}^b}\to\eta$ such that for $j=0,1$ we have $F(\partial_jW)\subset X\times\{j\}$ | + | # There exists a vector bundle $\eta$: $E'\to X\times[0,1]$ and there exist $b\in\mathbb{N}_0$ and a bundle map $(F,\overline{F})$: $TW\oplus\underline{\mathbb{R}^b}\to\eta$ such that |
+ | #* for $j=0,1$ we have $F(\partial_jW)\subset X\times\{j\}$ | ||
+ | #* $F$: $(W,\partial W)\to(X\times[0,1],X\times\partial[0,1])$ has degree one as a map between Poincare pairs. | ||
# For $j=0,1$ there exist diffeomorphisms $U_j$: $M_j\to\partial_jW$ such that $F\circ U_j=f_j$. | # For $j=0,1$ there exist diffeomorphisms $U_j$: $M_j\to\partial_jW$ such that $F\circ U_j=f_j$. | ||
# For $j=0,1$ there exist bundle isomorphisms $(\mathrm{id}_X,V_j)$: $\xi_j\oplus\underline{\mathbb{R}^{b-a_j+1}}\to\eta|_{X\times\{j\}}$ such that $$ | # For $j=0,1$ there exist bundle isomorphisms $(\mathrm{id}_X,V_j)$: $\xi_j\oplus\underline{\mathbb{R}^{b-a_j+1}}\to\eta|_{X\times\{j\}}$ such that $$ |
Revision as of 08:18, 3 April 2012
In both parts let be a connected finite Poincare complex of dimension and let .
Part 1
The following definition of the set of normal maps is similar to [Lück2001, Definition 3.46]. We define
Here
- is a vector bundle of rank k over ,
- is a closed manifold of dimension n,
- is an embedding,
- is a bundle map,
- is of degree .
We identify iff
- There exists a compact manifold of dimension whose boundary can be written as .
- There exists an embedding : such that for we have and meets transversally.
- There exists a vector bundle : of rank and for there exist vector bundle isomorphisms : .
- There exists a bundle map : such that
- for we have
- : has degree one as a map between Poincare pairs.
- For there exist diffeomorphisms : such that
- : is a diffeomorphism
- the induced bundle map : satisfies .
Part 2
The following definition of the set of tangential normal maps differs from [Lück2001, Definition 3.50]. We define
Here
- is a vector bundle of rank k over ,
- is a closed manifold of dimension n,
- ,
- is a bundle map and
- is degree 1.
We identify iff
- There exists a compact manifold of dimension whose boundary can be written as .
- There exists a vector bundle : and there exist and a bundle map : such that
- for we have
- : has degree one as a map between Poincare pairs.
- For there exist diffeomorphisms : such that .
- For there exist bundle isomorphisms : such that commutes. Here : is the differential of and : is given by an inward normal field of .
Part 1
The following definition of the set of normal maps is similar to [Lück2001, Definition 3.46]. We define
Here
- is a vector bundle of rank k over ,
- is a closed manifold of dimension n,
- is an embedding,
- is a bundle map,
- is of degree .
We identify iff
- There exists a compact manifold of dimension whose boundary can be written as .
- There exists an embedding : such that for we have and meets transversally.
- There exists a vector bundle : of rank and for there exist vector bundle isomorphisms : .
- There exists a bundle map : such that
- for we have
- : has degree one as a map between Poincare pairs.
- For there exist diffeomorphisms : such that
- : is a diffeomorphism
- the induced bundle map : satisfies .
Part 2
The following definition of the set of tangential normal maps differs from [Lück2001, Definition 3.50]. We define
Here
- is a vector bundle of rank k over ,
- is a closed manifold of dimension n,
- ,
- is a bundle map and
- is degree 1.
We identify iff
- There exists a compact manifold of dimension whose boundary can be written as .
- There exists a vector bundle : and there exist and a bundle map : such that
- for we have
- : has degree one as a map between Poincare pairs.
- For there exist diffeomorphisms : such that .
- For there exist bundle isomorphisms : such that commutes. Here : is the differential of and : is given by an inward normal field of .