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Results tagged with at.algebraic-topology
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user 18074
Homotopy theory, homological algebra, algebraic treatments of manifolds.
11
votes
2
answers
1k
views
Infinite loop space structure of $BU^+$
It is well-known that $BU^+$ is homotopy equivalent to an infinite loop space where $U$ is the limit of the unitary groups $U(n)$ for $n \rightarrow \infty$ and $+$ denotes Quillen's Plus construction …
- 165
1
vote
1
answer
583
views
When is a bijective map between bundles a homeomorphism?
Let $F \rightarrow E_i \rightarrow X_i$ be a bundle with fibre $F$ for i=1,2.
Let $f:E_1 \rightarrow E_2$ be a bijective continuous map and $h: X_1 \rightarrow X_2$ a homeomorphism.
Is f then also …
- 165
4
votes
2
answers
387
views
Twisted cohomology of the mapping class group
Let $M_{g,1}$ be the mapping class group of surfaces of genus g $\geq 1$ with one boundary component. By $S_g$ we denote a closed surface of genus $g$.
In the paper "Families of jacobian manifolds an …
- 165