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This tag refers to the (non-existent) "field of one element".

63 votes
Accepted

What is the field with one element?

As other have mentioned, F_1 does not exist of a field. Tits conjectured the existence of a "field of characteristic one" F_1 for which one would have the equality G(F_1) = W, where G is any Chevalley …
javier's user avatar
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4 votes

Elliptic Curves over F_1?

In most of the current schemes, it is very unlikely that elliptic curves are defined over F_1. They are certainly not in Deitmar's or Toen-Vaquie since they restric to toric varieties. For Soule/Conne …
javier's user avatar
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3 votes
Accepted

What should Spec Z[\sqrt{D}] x_{F_1} Spec \bar{F_1} be?

Sorry I didn't reply before, I somehow didn't read the question till now. I think your question is a bit misguided. The main problem I see with it is: what is $\text{Spec} \mathbb{Z}[\sqrt{D}]$ over F …
javier's user avatar
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3 votes

Are the closures of the tori in the decomposition of a torified variety toric varieties?

Sorry that I reply so late, I haven't been hanging much on MO recently. The quick answer to your question is no, the closure of tori appearing in the torification are in general not toric varieties. …
javier's user avatar
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