Skip to main content
MathOverflow
Sergei Ivanov's user avatar
Sergei Ivanov's user avatar
Sergei Ivanov's user avatar
Sergei Ivanov
  • Member for 14 years, 9 months
  • Last seen more than 5 years ago
Profile Activity
Stats
32,399
reputation
0
reached
0
answers
0
questions
Communities
About
I am a research fellow at St.Petersburg Department of Steklov Math Institute
Badges
View all badges
This user doesn’t have any gold badges yet.
14
silver badges
1
bronze badge
Posts

This user hasn’t posted yet.

Top network posts
View all network posts
122
solving $f(f(x))=g(x)$
104
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?
69
How to solve $f(f(x)) = \cos(x)$?
65
Is there a dense subset of the real plane with all pairwise distances rational?
65
Smoothness of distance function in Riemannian Manifolds