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Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.

6 votes
Accepted

Maximal compact subroup is dense in Zariski?

When talking about Zariski-topology it is important to specify which field you are working over! Over $\mathbb{C}$ the cirkel is not closed in the Zariski topology on the one-dimensional reductive com …
Vincent's user avatar
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75 votes
4 answers
5k views

What are reasons to believe that e is not a period?

In their 2001 paper defining periods, Kontsevich and Zagier (pdf) without further comment state that $e$ is conjecturally not a period while many other numbers showing up naturally (conjecturally) are …
Vincent's user avatar
  • 2,493