243

Questions

votes newest views recent

21

64

votes

4

answers

2k

views

Light rays bouncing in twisted tubes

mg.metric-geometry geometry ds.dynamical-systems billiards

dec 10 11 at 1:51 Joseph O'Rourke 43.2k●1●49●214

24

54

votes

5

answers

2k

views

Gaussian prime spirals

complex-geometry discrete-geometry prime-numbers

feb 17 at 1:03 Joseph O'Rourke 43.2k●1●49●214

9

49

votes

2

answers

2k

views

Light reflecting off Christmas-tree balls

geometry

dec 9 11 at 21:42 Joseph O'Rourke 43.2k●1●49●214

9

44

votes

4

answers

3k

views

Tying knots with reflecting lightrays

geometry knot-theory

nov 14 at 1:37 Joseph O'Rourke 43.2k●1●49●214

9

40

votes

8

answers

4k

views

Fair but irregular polyhedral dice

mg.metric-geometry geometry convex-polytopes classical-mechanics recreational

dec 11 11 at 21:49 Scott Sherman 111●2●2

7

38

votes

2

answers

1k

views

Topple height of randomly stacked bricks

pr.probability classical-mechanics reference-request

dec 10 11 at 2:22 Joseph O'Rourke 43.2k●1●49●214

19

36

votes

11

answers

3k

views

Why are matrices ubiquitous but hypermatrices rare?

linear-algebra tensor soft-question

dec 6 at 20:14 Gil Kalai 10.7k●6●80●144

9

35

votes

1

answer

1k

views

Exploding primes

prime-numbers recreational

may 12 12 at 15:02 quid 13k●31●51

13

33

votes

1

answer

2k

views

Why are there 1024 Hamiltonian cycles on an icosahedron?

graph-theory co.combinatorics

jan 16 11 at 17:38 ed-wynn 491●5●5

8

33

votes

1

answer

2k

views

Rolling a random walk on a sphere

random-walk pr.probability mg.metric-geometry

dec 10 11 at 2:21 Joseph O'Rourke 43.2k●1●49●214