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Sergei Ivanov
  • Member for 12 years, 5 months
  • Last seen more than 3 years ago
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I am a research fellow at St.Petersburg Department of Steklov Math Institute
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119
solving $f(f(x))=g(x)$
102
Is the sphere the only surface with circular projections? Or: Can we deduce a spherical Earth by observing that its shadows on the Moon are circular?
67
How to solve $f(f(x)) = \cos(x)$?
62
Smoothness of distance function in Riemannian Manifolds
61
Is there a dense subset of the real plane with all pairwise distances rational?

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