Sergei Ivanov

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Name Sergei Ivanov
Member for 3 years
Seen 9 hours ago
Website
Location Saint Petersburg, Russia
Age 40
I am a research fellow at St.Petersburg Department of Steklov Math Institute

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What elementary problems can you solve with schemes?

apr 4 at 0:18 Daniel Miller 2,311●8●23

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Can analysis detect torsion in cohomology?

apr 25 10 at 14:45 Tim Perutz 8,655●1●16●42

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Atiyah-Singer index theorem

feb 24 11 at 7:20 Ezra Getzler 439●1●5●7

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Covering a circle with red and blue arcs

jun 23 10 at 10:36 Peter Shor 4,465●22●46

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Open map D⁴ → S²

may 10 at 6:22 MathOverflow♦ 1●2●3

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Number of subgroups in a Bieberbach group.

apr 9 11 at 2:49 Anton Petrunin 16.4k●41●110

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Pairwise intersecting sets of fixed size

feb 7 11 at 15:32 Zsbán Ambrus 729●6●12

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Generalization of Borsuk-Ulam

apr 11 11 at 16:54 Michael Renardy 4,771●1●10●17

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Handling arXiv feeds to avoid duplicates

jan 4 at 6:09 Yuichiro Fujiwara 1,304●1●4●14

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$f\circ f=g$ revisited

mar 20 10 at 21:35 Ady 2,641●6●21

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