User Hao Chen

33 votes

4 answers

3k views

When is an erratum necessary?

soft-question journals

asked Nov 20, 2015 at 12:11

14 votes

0 answers

2k views

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

sphere-packing

asked Feb 19, 2013 at 14:05

10 votes

1 answer

280 views

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

co.combinatorics graph-theory graph-colorings

asked Oct 20, 2014 at 19:37

10 votes

1 answer

399 views

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

discrete-geometry tiling

asked Aug 24, 2015 at 21:56

9 votes

0 answers

287 views

Neighborly family of coins

discrete-geometry

asked Mar 2, 2015 at 14:06

7 votes

2 answers

120 views

Graph embedding that locally minimizes total edge lengths

reference-request graph-theory calculus-of-variations

asked Oct 23, 2020 at 10:54

7 votes

1 answer

324 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

asked Jul 10, 2014 at 22:50

7 votes

2 answers

389 views

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

gt.geometric-topology hyperbolic-geometry coxeter-groups

asked Apr 23, 2014 at 8:50

6 votes

1 answer

507 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

asked Jun 20, 2012 at 9:01

5 votes

1 answer

232 views

Generalized Plateau problem with non-Jordan boundary

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

asked Feb 14, 2016 at 15:47

5 votes

0 answers

78 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

asked Nov 25, 2016 at 22:49

5 votes

1 answer

277 views

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

reference-request at.algebraic-topology knot-link

asked Apr 18, 2019 at 13:45

4 votes

1 answer

992 views

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

co.combinatorics coding-theory combinatorial-designs

asked Jun 20, 2014 at 13:26

4 votes

0 answers

167 views

Graph drawing maximizing the volume of the convex hull

graph-theory discrete-geometry

asked Mar 18, 2013 at 12:53

3 votes

1 answer

446 views

Eigenvalues for elements of (infinite) Coxeter groups

coxeter-groups sp.spectral-theory

asked Jun 21, 2013 at 13:46

3 votes

0 answers

457 views

Is the limit set of a group action always closed?

group-actions gn.general-topology

asked Nov 26, 2013 at 22:53

3 votes

0 answers

95 views

Symmetries of irregular simplices

reference-request finite-groups symmetry

asked Oct 7, 2017 at 0:09

3 votes

0 answers

110 views

Infinite counter-examples to Borsuk conjecture

discrete-geometry

asked Feb 12, 2015 at 6:29

2 votes

0 answers

78 views

Are the following hyperplane arrangements previously studied?

reference-request hyperplane-arrangements

asked Oct 27, 2017 at 21:54

2 votes

1 answer

83 views

Behaviour of elliptic functions near degenerate lattice

elliptic-functions

asked Jun 16, 2018 at 9:56

2 votes

1 answer

114 views

How many edges guarantee an expander?

expander-graphs

asked Apr 16, 2015 at 14:28

1 vote

0 answers

68 views

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

hyperplane-arrangements oriented-matroids

asked Oct 14, 2014 at 8:04

1 vote

0 answers

296 views

Which term is better for the so called "sphere packing"?

sphere-packing circle-packing terminology

asked Dec 7, 2012 at 10:52

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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

Graph embedding that locally minimizes total edge lengths

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 ?

Generalized Plateau problem with non-Jordan boundary

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

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

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

Graph drawing maximizing the volume of the convex hull

Eigenvalues for elements of (infinite) Coxeter groups

Is the limit set of a group action always closed?

Symmetries of irregular simplices

Infinite counter-examples to Borsuk conjecture

Are the following hyperplane arrangements previously studied?

Behaviour of elliptic functions near degenerate lattice

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"?