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Oct 5, 2015 at 11:41 comment added Sean Tilson You can also interpret $\chi$ as part of the structure of an affine group scheme. Is that what you mean by geometric?
Oct 3, 2015 at 15:32 comment added Neil Strickland What do you mean by geometric? You can identify $A$ with $\pi_*(H\wedge H)$, and $\chi$ comes from the map that switches the two factors of $H$. That is a spectrum-level description, which might or might not be considered geometric.
Oct 3, 2015 at 10:23 answer added David C timeline score: 13
S Oct 3, 2015 at 10:04 history edited Marco Golla CC BY-SA 3.0
Added tags, improved formatting
S Oct 3, 2015 at 10:04 history suggested user43326
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Oct 3, 2015 at 9:50 review Suggested edits
S Oct 3, 2015 at 10:04
Oct 3, 2015 at 8:31 review First posts
Oct 3, 2015 at 8:37
Oct 3, 2015 at 8:28 history asked DavidT CC BY-SA 3.0