Sergei Ivanov's user avatar
Sergei Ivanov's user avatar
Sergei Ivanov's user avatar
Sergei Ivanov
  • Member for 14 years, 1 month
  • Last seen more than a month ago
12 votes
Accepted

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

12 votes
Accepted

Nonexistence of determinantal functional equation for $\arccos$

12 votes
Accepted

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

12 votes
Accepted

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

12 votes
Accepted

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

12 votes

gradient of convex functions

12 votes
Accepted

Isometric embedding a convex cap to render its boundary planar

12 votes
Accepted

Product of random diagonals on the unit circle

12 votes
Accepted

A problem on infinite dimensional metric space

12 votes
Accepted

A characterization of Hilbert spaces?

12 votes
Accepted

Discretization of a complete manifold

11 votes
Accepted

computational complexity

11 votes

Infimum of a finite number of distances in the plane

11 votes
Accepted

Volume change under linear transformation

11 votes
Accepted

Alexandrov geometry techniques for Finsler manifolds.

11 votes
Accepted

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

11 votes

A Converse to the Gauss Bonnet Theorem

11 votes
Accepted

subsets of products of trees

11 votes
Accepted

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

11 votes

Positive solutions of linear Diophantine equations

10 votes
Accepted

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

10 votes
Accepted

Triangles, squares, and discontinuous complex functions

10 votes
Accepted

About the Gauss map of a surface in euclidean 3 space

10 votes

What is torsion in differential geometry intuitively?

10 votes
Accepted

A decision problem concerning Diophantine inequalities

10 votes

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

10 votes

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

10 votes

Publishing journals articles without transferring copyright.

10 votes
Accepted

Existence of extreme points

10 votes

Area of intersection of a family of circles in the plane

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