David Feldman's user avatar
David Feldman's user avatar
David Feldman's user avatar
David Feldman
  • Member for 13 years, 4 months
  • Last seen more than a week ago
49 votes
4 answers
6k views

If the Riemann Hypothesis fails, must it fail infinitely often?

97 votes
19 answers
36k views

Collecting proofs that finite multiplicative subgroups of fields are cyclic

20 votes
2 answers
2k views

Tennenbaum's Theorem and polynomials

4 votes
3 answers
1k views

Probability theory and measuring the true strength of chessplayers

382 votes
115 answers
105k views

Not especially famous, long-open problems which anyone can understand

1 vote
0 answers
118 views

Roth's Theorem Variations?

12 votes
5 answers
2k views

Galois theory and algorithms

3 votes
0 answers
118 views

Basic obstruction to anything like holomophic symmetric functions of infinitely many variables?

2 votes
0 answers
68 views

Zero sets of integral power series that converge on disks

11 votes
4 answers
1k views

Knot diagrams, sets of moves and equivalence relations

85 votes
17 answers
6k views

Important open problems that have already been reduced to a finite but infeasible amount of computation

15 votes
1 answer
1k views

In ZF, when is a disjoint union of metrizable spaces metrizable?

13 votes
1 answer
1k views

Is every $\sigma$-algebra of sets *abstractly* the Borel algebra of a topology on perhaps some other set?

5 votes
0 answers
273 views

A certain kind of proof of the Hairy Ball Theorem

66 votes
1 answer
4k views

(Approximately) bijective proof of $\zeta(2)=\pi^2/6$?

18 votes
3 answers
1k views

Games that never begin

12 votes
3 answers
2k views

Cantor's diagonal argument and ZF

7 votes
3 answers
1k views

Prime constellation conjectures

10 votes
3 answers
1k views

Non-linear "Fourier analysis"

10 votes
2 answers
652 views

Good notions of "perfect number" for rings of integers more general than ${\Bbb Z}$?

24 votes
12 answers
3k views

Constructions unique up to non-unique isomorphism

52 votes
8 answers
5k views

What are the external triumphs of matroid theory?

20 votes
1 answer
872 views

Does the Fourier expansion of the j-function have any prime coefficients?

3 votes
0 answers
84 views

A graded version of the Koethe conjecture

5 votes
2 answers
481 views

Computer platforms for combinatorial search problems/mathematical music theory?

8 votes
4 answers
663 views

Ultrafilters and the exposition of forcing

10 votes
4 answers
620 views

Packing and isoperimetrics

16 votes
1 answer
878 views

Hearing the 17 planar symmetry groups

14 votes
4 answers
1k views

Localic locales? Towards very pointless spaces by iterated internalization.

23 votes
1 answer
737 views

The Euler-Mascheroni constant and entropy

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