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Martin M. W.
  • Member for 12 years, 7 months
  • Last seen this week
183 votes
8 answers
11k views

Two commuting mappings in the disk

  • 52.3k
94 votes
11 answers
12k views

Is it possible to capture a sphere in a knot?

  • 8,175
43 votes
12 answers
2k views

Can a discrete set of the plane of uniform density intersect all large triangles?

39 votes
3 answers
2k views

Is there an elementary proof that distal maps are invertible?

  • 1,159
36 votes
2 answers
2k views

A question about connected subsets of $[0,1]^2$

31 votes
2 answers
1k views

Can $[0,1]^4$ be partitioned into copies of $(0,1)^3$?

  • 14.8k
27 votes
7 answers
4k views

When is a monic integer polynomial the characteristic polynomial of a non-negative integer matrix?

27 votes
6 answers
2k views

When shorter means smaller?

22 votes
4 answers
2k views

Minimal surface in a ball

16 votes
3 answers
1k views

Does a random walk on a surface visit uniformly?

15 votes
2 answers
575 views

Three squares in a rectangle

  • 153
11 votes
1 answer
625 views

Smoothness of distance function to a compact set