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Aug 19, 2019 at 13:57 comment added Thomas Rot @JesseC.McKeown: Just a ping
Aug 19, 2019 at 13:57 answer added Thomas Rot timeline score: 4
Apr 13, 2017 at 12:58 history edited CommunityBot
replaced http://mathoverflow.net/ with https://mathoverflow.net/
Aug 31, 2016 at 1:33 comment added Jesse C. McKeown Being the Jesse mentioned, I'm also keen to understand what my spaces actually are, and well open to the possibility that they're not BU(n)s.
Aug 29, 2016 at 7:47 comment added Thomas Rot Let $\mathcal{K}_k^l$ be the space of index $k$ Fredholm operators whose kernel is $l$ dimensional. There is a fiber sequence $GL(\mathbb{H})\rightarrow \mathcal{K}_k^l\rightarrow BU(l)\times BU(k-l)$ where the right map is mapping an operator to the kernel times the cokernel. It follows that $\mathcal{K}_k^l$ is homotopy equivalent to $BU(l)\times BU(k-l)$. I do not now what happens when one takes the union over $l\leq l_0$.
Aug 29, 2016 at 6:53 history edited Gregory Arone CC BY-SA 3.0
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Aug 28, 2016 at 16:54 history edited Gregory Arone CC BY-SA 3.0
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Aug 28, 2016 at 16:45 history asked Gregory Arone CC BY-SA 3.0