User Anton Petrunin

0 votes

0 answers

35 views

Alexandrov's uniqueness theorem in Minkowski spacetime

asked Apr 12 at 12:32

27 votes

8 answers

5k views

Convex hull in CAT(0)

asked Nov 23, 2009 at 22:06

9 votes

1 answer

508 views

Shortest almost trivial element of free group [duplicate]

asked Feb 14 at 0:50

2 votes

0 answers

76 views

Nested convex hulls in Hadamard manifold

asked Feb 4 at 20:27

23 votes

1 answer

1k views

Universal graph

asked Jan 22 at 17:16

35 votes

4 answers

3k views

Psychological test for Euclidean geometry [closed]

asked Dec 24, 2023 at 22:04

96 votes

79 answers

17k views

Elementary+Short+Useful

asked Apr 3, 2011 at 17:34

4 votes

1 answer

172 views

Bounded covariant derivative of curvature tensor

asked Nov 24, 2023 at 22:30

6 votes

2 answers

723 views

Bolyai's construction

asked Nov 7, 2010 at 23:46

15 votes

2 answers

1k views

Positive quadratic polynomial

asked Sep 23, 2023 at 16:25

12 votes

1 answer

885 views

Positive 4-form

asked Sep 30, 2023 at 16:43

24 votes

4 answers

4k views

Fundamental group of 3-manifold with boundary

asked Nov 19, 2009 at 17:00

5 votes

2 answers

633 views

Is there an English alternative to Blaschke's "Kreis und Kugel"?

asked Aug 25, 2011 at 18:32

5 votes

1 answer

539 views

Morse theory for manifolds with boundary

asked Aug 11, 2023 at 15:09

6 votes

2 answers

483 views

The set of non-smooth points of a convex function is (m - 1)-rectifiable

asked May 23, 2010 at 19:53

2 votes

1 answer

213 views

Wrapping a suitcase with large rotational symmetry

asked Jun 13, 2023 at 18:32

122 votes

37 answers

11k views

One-step problems in geometry

asked Dec 8, 2009 at 20:56

8 votes

0 answers

156 views

Normal curvature of Veronese embedding

asked Apr 30, 2023 at 12:48

9 votes

0 answers

334 views

Embedding a graph into Euclidean space

asked Feb 8, 2023 at 13:56

22 votes

0 answers

514 views

Sphere with bounded curvature

asked Jun 26, 2022 at 14:20

3 votes

1 answer

309 views

Simplified Bing's house

asked Feb 15, 2023 at 12:05

6 votes

1 answer

254 views

Sphere in Urysohn space

asked May 5, 2022 at 19:14

5 votes

1 answer

284 views

Stable torus that is not a torus [duplicate]

asked Nov 14, 2022 at 10:47

36 votes

2 answers

2k views

Bodies of constant width?

asked Jan 26, 2012 at 17:57

9 votes

2 answers

310 views

Generalized figures of constant width

asked May 28, 2020 at 18:46

8 votes

0 answers

244 views

Did these graphs pop up somewhere?

asked Dec 9, 2022 at 21:10

3 votes

0 answers

168 views

Short selection in the space of subsets

asked Nov 23, 2022 at 10:41

4 votes

0 answers

157 views

Name for a chain-like graph

asked Dec 6, 2022 at 20:16

20 votes

3 answers

3k views

Who is Kirszbraun?

asked Oct 28, 2010 at 0:57

5 votes

1 answer

280 views

All-set-homogeneous spaces

asked Sep 3, 2022 at 13:36

Stack Exchange Network

129 Questions

Alexandrov's uniqueness theorem in Minkowski spacetime

Convex hull in CAT(0)

Shortest almost trivial element of free group [duplicate]

Nested convex hulls in Hadamard manifold

Universal graph

Psychological test for Euclidean geometry [closed]

Elementary+Short+Useful

Bounded covariant derivative of curvature tensor

Bolyai's construction

Positive quadratic polynomial

Positive 4-form

Fundamental group of 3-manifold with boundary

Is there an English alternative to Blaschke's "Kreis und Kugel"?

Morse theory for manifolds with boundary

The set of non-smooth points of a convex function is (m - 1)-rectifiable

Wrapping a suitcase with large rotational symmetry

One-step problems in geometry

Normal curvature of Veronese embedding

Embedding a graph into Euclidean space

Sphere with bounded curvature

Simplified Bing's house

Sphere in Urysohn space

Stable torus that is not a torus [duplicate]

Bodies of constant width?

Generalized figures of constant width

Did these graphs pop up somewhere?

Short selection in the space of subsets

Name for a chain-like graph

Who is Kirszbraun?

All-set-homogeneous spaces