User BS.

44 votes

Accepted

Computational complexity of computing homotopy groups of spheres

answered Jul 8, 2010 at 13:42

31 votes

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connectivity of the group of orientation-preserving homeomorphisms of the sphere

answered Sep 25, 2010 at 17:17

29 votes

Vanishing of Euler class

answered Jul 11, 2010 at 11:54

26 votes

Examples of non-diffeomorphic smooth manifolds with diffeomorphic tangent bundle

answered Jul 13, 2010 at 12:24

24 votes

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Conformal embedding of Riemann surfaces into 3-space

answered Feb 1, 2011 at 17:40

23 votes

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A property of the unit circle

answered Aug 3, 2013 at 13:50

20 votes

Without choice, can every homomorphism from a profinite group to a finite group be continuous?

answered Sep 3, 2012 at 10:52

20 votes

Is the boundary $\partial S$ analogous to a derivative?

answered Nov 16, 2010 at 21:39

19 votes

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Topologies on the field of rationals

answered Sep 5, 2012 at 17:43

18 votes

Cheap, non-constructive, free group generating rotations for Banach-Tarski

answered Dec 14, 2010 at 9:36

17 votes

Which immersed plane curves bound an immersed disk?

answered Jun 21, 2012 at 11:37

16 votes

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Is a smooth action of a semi-simple Lie group linearizable near a stationary point?

answered Dec 10, 2010 at 14:15

16 votes

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Nice orthonormal basis for L^2(Cantor set)

answered Aug 3, 2010 at 16:20

15 votes

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Group ring computation

answered Jan 8, 2011 at 11:24

15 votes

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Infinite simple Galois groups

answered Jan 29, 2011 at 14:12

15 votes

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Fourier transform of a bounded function

answered May 9, 2013 at 14:36

14 votes

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Equivalence between statements of Hodge conjecture

answered Jul 28, 2012 at 14:05

13 votes

Double a manifold with boundary

answered Sep 25, 2012 at 10:29

13 votes

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Closure of the orbits of the $SL(2,\mathbb{Z})$-action on $\mathbb{R}^2$

answered Nov 17, 2014 at 20:44

13 votes

Is the space of immersions of $S^n$ into $\mathbb R^{n+1}$ simply connected?

answered May 7, 2015 at 22:12

13 votes

Accepted

Norm of $n$-linear symmetric forms

answered May 30, 2015 at 19:35

11 votes

Are manifolds admitting a circle foliation covered by manifolds with a (non-trivial) circle action?

answered Sep 2, 2019 at 14:26

11 votes

Simultaneous diophantine approximation

answered Sep 10, 2012 at 15:23

11 votes

Accepted

Is the tangent bundle of the long line $L$ homeomorphic to $L\times\mathbb R$?

answered Aug 10, 2010 at 13:42

10 votes

Is there a measure zero set which isn't meagre?

answered Oct 25, 2010 at 9:47

10 votes

Why is the Hahn-Banach theorem so important?

answered May 31, 2010 at 14:30

10 votes

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Can a metric conformal to a Kahler metric be Kahler?

answered Jul 8, 2011 at 13:49

9 votes

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Kazhdan's property T for Kahler surfaces

answered Mar 25, 2012 at 13:13

9 votes

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Finite, abelian, yet "fugitive" orthogonal subgroups

answered Feb 27, 2012 at 16:02

9 votes

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Holomorphic functions in almost-complex geometry

answered Dec 1, 2010 at 11:28

Stack Exchange Network

106 Answers

Computational complexity of computing homotopy groups of spheres

connectivity of the group of orientation-preserving homeomorphisms of the sphere

Vanishing of Euler class

Examples of non-diffeomorphic smooth manifolds with diffeomorphic tangent bundle

Conformal embedding of Riemann surfaces into 3-space

A property of the unit circle

Without choice, can every homomorphism from a profinite group to a finite group be continuous?

Is the boundary $\partial S$ analogous to a derivative?

Topologies on the field of rationals

Cheap, non-constructive, free group generating rotations for Banach-Tarski

Which immersed plane curves bound an immersed disk?

Is a smooth action of a semi-simple Lie group linearizable near a stationary point?

Nice orthonormal basis for L^2(Cantor set)

Group ring computation

Infinite simple Galois groups

Fourier transform of a bounded function

Equivalence between statements of Hodge conjecture

Double a manifold with boundary

Closure of the orbits of the $SL(2,\mathbb{Z})$-action on $\mathbb{R}^2$

Is the space of immersions of $S^n$ into $\mathbb R^{n+1}$ simply connected?

Norm of $n$-linear symmetric forms

Are manifolds admitting a circle foliation covered by manifolds with a (non-trivial) circle action?

Simultaneous diophantine approximation

Is the tangent bundle of the long line $L$ homeomorphic to $L\times\mathbb R$?

Is there a measure zero set which isn't meagre?

Why is the Hahn-Banach theorem so important?

Can a metric conformal to a Kahler metric be Kahler?

Kazhdan's property T for Kahler surfaces

Finite, abelian, yet "fugitive" orthogonal subgroups

Holomorphic functions in almost-complex geometry