Joseph O'Rourke's user avatar
Joseph O'Rourke's user avatar
Joseph O'Rourke's user avatar
Joseph O'Rourke
  • Member for 13 years, 10 months
  • Last seen this week
4 votes
1 answer
266 views

Billiard circuits in pentagons

8 votes
0 answers
105 views

Is there an inventory of closed billiard paths in a regular tetrahedron?

3 votes
2 answers
188 views

Random walk to visible lattice points

3 votes
1 answer
353 views

Illumination from visible lattice points with inverse square intensity

10 votes
0 answers
157 views

Minimum reflection paths in a mirror polygon

8 votes
0 answers
498 views

Landau's century-old problems: Anything comparable?

13 votes
3 answers
357 views

Intersecting cylinders around a sphere

2 votes
0 answers
48 views

Endpoints of intrinsic diameter of a convex polyhedron

3 votes
1 answer
90 views

Convex polygon shadows: Shortest equivalent segments

16 votes
1 answer
871 views

Kakeya crossed-needles problem

17 votes
2 answers
2k views

Sum of reciprocals of Sophie Germain primes

6 votes
1 answer
394 views

Can every smooth space curve be realized as an origami curved crease?

10 votes
2 answers
2k views

Great polyhedra: What does "great" signify?

7 votes
0 answers
210 views

Tiling space with supertile of hypercube unfoldings

1 vote
1 answer
103 views

Characterization of greedy TSPs?

15 votes
4 answers
795 views

Unlinked interlocking planar polygons

3 votes
1 answer
256 views

Infinite number of closed geodesics on distorted sphere

9 votes
2 answers
371 views

Which convex bodies roll straight?

1 vote
1 answer
160 views

Minimal surface enclosing balls

8 votes
1 answer
206 views

Minimal surface enclosing two congruent balls

0 votes
0 answers
101 views

Knots with everywhere positive curvature

1 vote
1 answer
513 views

Factorial primes: expected finite or infinite?

15 votes
1 answer
1k views

Gauss-Bonnet Theorem: Neither Gauss nor Bonnet [closed]

5 votes
2 answers
306 views

Dimension of configuration space of triangulated convex polyhedron

2 votes
0 answers
61 views

Rigid monohedral tilers

18 votes
3 answers
2k views

Heat map of current mathematics

16 votes
3 answers
1k views

Does a random walk on a surface visit uniformly?

6 votes
0 answers
153 views

Is the unit-stick number of a knot equal to its stick number?

24 votes
1 answer
1k views

Which unfoldings of the $d$-dimensional hypercube tile $(d{-}1)$-space?

22 votes
2 answers
877 views

Is every 1-million-connected graph rigid in 3D?

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