User Hao Chen

5

32

votes

4

answers

3k

views

When is an erratum necessary?

soft-question journals

Nov 30 '15 at 1:25 Edward Dunne 2,178

5

14

votes

0

answers

2k

views

How many unit balls can be put into a unit cube?

sphere-packing

Sep 14 '14 at 13:32 Community♦ 1

3

10

votes

1

answer

262

views

What is known about the chromatic number for minimum-distance graphs in higher dimensions?

co.combinatorics graph-theory graph-colorings

Jan 6 '16 at 12:56 Gil Kalai 23.1k

2

10

votes

1

answer

374

views

What can we learn from the newly discovered monohedral convex pentagonal tiling?

discrete-geometry tiling

Aug 25 '15 at 6:48 Hao Chen 2,309

2

9

votes

0

answers

283

views

Neighborly family of coins

discrete-geometry

Mar 16 '15 at 12:34 Hao Chen 2,309

7

votes

1

answer

320

views

For a 3D Apollonian packing, do we really know that the Hausdorff dimension of the complement is approximated by the growth rate of curvature?

reference-request hyperbolic-geometry fractals sphere-packing

Sep 14 '14 at 9:35 Community♦ 1

7

votes

2

answers

370

views

Are there infinitely many commensurable classes of finite-covolume hyperbolic Coxeter groups?

gt.geometric-topology hyperbolic-geometry coxeter-groups

Apr 24 '14 at 5:43 Neil Hoffman 4,981

1

6

votes

1

answer

453

views

How does the distribution of Erdős number evolve over time ? How to build a model to fit the real data ?

random-graphs graph-theory stochastic-processes

Sep 12 '14 at 18:17 Community♦ 1

1

5

votes

1

answer

205

views

Non-zero winding number on a space curve implies a linked curve in the zero set?

reference-request at.algebraic-topology knot-link

Apr 19 '19 at 15:56 Hao Chen 2,309

1

5

votes

0

answers

74

views

Is every space group the symmetry group of some triply periodic minimal surface?

reference-request dg.differential-geometry gr.group-theory crystals minimal-surfaces

Nov 25 '16 at 22:52 YCor 42.3k

1

4

votes

1

answer

70

views

Graph embedding that locally minimizes total edge lengths

reference-request graph-theory calculus-of-variations

Dec 26 at 10:01 Community♦ 1

3

4

votes

1

answer

954

views

“Codes” in which a group of words are pairwise different at a certain position

co.combinatorics coding-theory combinatorial-designs

Jun 8 '17 at 0:04 Ryan 103

4

votes

1

answer

208

views

Generalized Plateau problem with non-Jordan boundary

reference-request dg.differential-geometry ca.classical-analysis-and-odes

Feb 16 '16 at 18:56 Joel Hass 801

4

votes

0

answers

166

views

Graph drawing maximizing the volume of the convex hull

graph-theory discrete-geometry

Mar 18 '13 at 15:59 Hao Chen 2,309

1

3

votes

1

answer

379

views

Eigenvalues for elements of (infinite) Coxeter groups

coxeter-groups sp.spectral-theory

May 5 at 15:28 Harry Richman 1,893

1

3

votes

0

answers

109

views

Infinite counter-examples to Borsuk conjecture

discrete-geometry

Feb 12 '15 at 6:52 Hao Chen 2,309

3

votes

0

answers

396

views

Is the limit set of a group action always closed?

group-actions gn.general-topology

Nov 27 '13 at 10:00 Hao Chen 2,309

2

votes

1

answer

78

views

Behaviour of elliptic functions near degenerate lattice

elliptic-functions

Jun 16 '18 at 18:00 Hao Chen 2,309

2

votes

0

answers

75

views

Are the following hyperplane arrangements previously studied?

reference-request hyperplane-arrangements

Oct 27 '17 at 22:05 Hao Chen 2,309

1

2

votes

0

answers

70

views

Symmetries of irregular simplices

reference-request finite-groups symmetry

Oct 7 '17 at 0:23 Hao Chen 2,309

2

votes

1

answer

111

views

How many edges guarantee an expander?

expander-graphs

Apr 16 '15 at 14:43 user36212 1,657

1

vote

0

answers

68

views

What are / could be the applications of Delaunay oriented matroids?

hyperplane-arrangements oriented-matroids

Oct 14 '14 at 8:04 Hao Chen 2,309

1

vote

0

answers

290

views

Which term is better for the so called “sphere packing”?

sphere-packing circle-packing terminology

Dec 7 '12 at 11:20 Hao Chen 2,309

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23 Questions

When is an erratum necessary?

How many unit balls can be put into a unit cube?

What is known about the chromatic number for minimum-distance graphs in higher dimensions?

What can we learn from the newly discovered monohedral convex pentagonal tiling?

Neighborly family of coins

For a 3D Apollonian packing, do we really know that the Hausdorff dimension of the complement is approximated by the growth rate of curvature?

Are there infinitely many commensurable classes of finite-covolume hyperbolic Coxeter groups?

How does the distribution of Erdős number evolve over time ? How to build a model to fit the real data ?

Non-zero winding number on a space curve implies a linked curve in the zero set?

Is every space group the symmetry group of some triply periodic minimal surface?

Graph embedding that locally minimizes total edge lengths

“Codes” in which a group of words are pairwise different at a certain position

Generalized Plateau problem with non-Jordan boundary

Graph drawing maximizing the volume of the convex hull

Eigenvalues for elements of (infinite) Coxeter groups

Infinite counter-examples to Borsuk conjecture

Is the limit set of a group action always closed?

Behaviour of elliptic functions near degenerate lattice

Are the following hyperplane arrangements previously studied?

Symmetries of irregular simplices

How many edges guarantee an expander?

What are / could be the applications of Delaunay oriented matroids?

Which term is better for the so called “sphere packing”?