User Sergei Ivanov

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Is a rhombus rigid on a sphere or torus? And generalizations

answered Sep 29, 2010 at 20:24

12 votes

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Shadow boundary on convex body in $\mathbb{R}^3$

answered Jan 30, 2011 at 2:12

12 votes

gradient of convex functions

answered Oct 27, 2011 at 15:11

12 votes

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Compactness of the class of connected sets with perimetre smaller than 1?

answered Aug 4, 2011 at 8:44

12 votes

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Nice proof of the triangle inequality for the metric of the hyperbolic plane

answered Apr 16, 2010 at 19:30

12 votes

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Nonexistence of determinantal functional equation for $\arccos$

answered May 2, 2010 at 9:06

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Covering a circle with red and blue arcs

answered Jun 23, 2010 at 10:10

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Product of random diagonals on the unit circle

answered Sep 10, 2012 at 9:25

12 votes

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A problem on infinite dimensional metric space

answered Oct 3, 2013 at 0:26

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Discretization of a complete manifold

answered Dec 11, 2012 at 20:27

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computational complexity

answered Jan 9, 2013 at 8:58

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A characterization of Hilbert spaces?

answered May 12, 2013 at 22:16

11 votes

Infimum of a finite number of distances in the plane

answered Apr 2, 2013 at 15:39

11 votes

A Converse to the Gauss Bonnet Theorem

answered Feb 12, 2014 at 20:22

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Does the metric space of compact metric spaces satisfy the binary intersection property?

answered Nov 17, 2012 at 18:10

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Alexandrov geometry techniques for Finsler manifolds.

answered Apr 12, 2012 at 2:11

11 votes

Positive solutions of linear Diophantine equations

answered May 9, 2010 at 9:03

11 votes

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Volume change under linear transformation

answered Nov 9, 2011 at 22:40

11 votes

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subsets of products of trees

answered Sep 29, 2010 at 22:08

11 votes

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Effective contraction of a loop. Reference or a simple proof?

answered Sep 21, 2010 at 23:44

10 votes

Is there a field which is the union of finitely many proper subfields?

answered Sep 22, 2010 at 20:49

10 votes

Geodesics in $\mathbb{R}^2 \times \mathbb{S}^1$ under "segment" metric

answered Sep 24, 2011 at 0:31

10 votes

Area of intersection of a family of circles in the plane

answered May 10, 2011 at 14:10

10 votes

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Explicit extension of Lipschitz function (Kirszbraun theorem)

answered May 10, 2011 at 17:30

10 votes

Towards a metric characterization of Euclidean spaces

answered May 13, 2011 at 21:09

10 votes

Publishing journals articles without transferring copyright.

answered May 14, 2011 at 21:10

10 votes

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Existence of extreme points

answered Mar 21, 2011 at 17:15

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Characterizing a tumbling convex polytope from the surface areas of its two-dimensional projections

answered May 15, 2010 at 7:54

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Triangles, squares, and discontinuous complex functions

answered Mar 19, 2010 at 18:51

10 votes

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About the Gauss map of a surface in euclidean 3 space

answered Mar 28, 2010 at 9:46

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227 Answers

Is a rhombus rigid on a sphere or torus? And generalizations

Shadow boundary on convex body in $\mathbb{R}^3$

gradient of convex functions

Compactness of the class of connected sets with perimetre smaller than 1?

Nice proof of the triangle inequality for the metric of the hyperbolic plane

Nonexistence of determinantal functional equation for $\arccos$

Covering a circle with red and blue arcs

Product of random diagonals on the unit circle

A problem on infinite dimensional metric space

Discretization of a complete manifold

computational complexity

A characterization of Hilbert spaces?

Infimum of a finite number of distances in the plane

A Converse to the Gauss Bonnet Theorem

Does the metric space of compact metric spaces satisfy the binary intersection property?

Alexandrov geometry techniques for Finsler manifolds.

Positive solutions of linear Diophantine equations

Volume change under linear transformation

subsets of products of trees

Effective contraction of a loop. Reference or a simple proof?

Is there a field which is the union of finitely many proper subfields?

Geodesics in $\mathbb{R}^2 \times \mathbb{S}^1$ under "segment" metric

Area of intersection of a family of circles in the plane

Explicit extension of Lipschitz function (Kirszbraun theorem)

Towards a metric characterization of Euclidean spaces

Publishing journals articles without transferring copyright.

Existence of extreme points

Characterizing a tumbling convex polytope from the surface areas of its two-dimensional projections

Triangles, squares, and discontinuous complex functions

About the Gauss map of a surface in euclidean 3 space