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# Questions

3
6
3
1k
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### A free subgroup of GL(2,Z)?

nov 22 10 at 10:40 Derek Holt 6,86811227

5
3
4
747
views

### Commuting matrices in GL(n,Z)

feb 16 11 at 17:37 David Speyer 55.1k3102236

1
7
2
433
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### Non-Hölder continuous devil’s staircases

nov 6 10 at 3:20 Vaughn Climenhaga 3,9411824

1
5
2
338
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### Isodiametric hull

sep 18 10 at 3:49 Bill Thurston 17.6k862100

6
3
259
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### Large geodesically convex subsets of tori

jan 17 12 at 15:20 Anton Petrunin 16.5k41110

3
0
191
views

### An identity which involves Euler’s totient function

nov 14 at 21:46 Nikita Sidorov 1,1061411

3