David Feldman's user avatar
David Feldman's user avatar
David Feldman's user avatar
David Feldman
  • Member for 13 years, 4 months
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7 votes
1 answer
503 views

Paths in groups

7 votes
0 answers
464 views

Closure properties of familes of $G_\delta$ sets.

7 votes
0 answers
273 views

A strange planar set and the Continuum Hypothesis

6 votes
1 answer
651 views

Local differential geometry and invariant theory

6 votes
1 answer
325 views

"Urban paths" in a Riemannian manifold

6 votes
3 answers
703 views

Subgroups of finitary symmetric groups

6 votes
2 answers
384 views

Are Vitali-type nonmeasurable sets determinate?

6 votes
1 answer
474 views

Topological dynamics and Turing complete automata

6 votes
1 answer
518 views

Which maximal closed subgroups of Lie groups are maximal subgroups?

6 votes
1 answer
525 views

Weak form of the $abc$-conjecture?

6 votes
1 answer
462 views

Theory of addition and a predicate that recognizes powers of 2

6 votes
1 answer
527 views

The identity $\sum_n \ln(n) x^n = \sum_p ln(p)(\sum_k\frac{x^{p^k}}{1-x^{p^k}})$

6 votes
0 answers
181 views

Decision problem concerning factors of a special family of polynomials.

6 votes
0 answers
485 views

Inverse Galois Problem...and parallelizable vector fields?

6 votes
1 answer
275 views

Words in two infinitismal rotations

5 votes
2 answers
560 views

Zorn's Lemma and plane geometry

5 votes
0 answers
530 views

Studying primes via the gamma function alone: $(x+1)\prod_n \Gamma(\frac{x}{n}+1)^{\mu(n)}$

5 votes
0 answers
979 views

Maximal ideals in polynomial rings over algebraically closed fields - when Weak Nullstellensatz does not apply

5 votes
2 answers
481 views

Computer platforms for combinatorial search problems/mathematical music theory?

5 votes
0 answers
131 views

Possible homogeneity of infinite dimensional Sierpinski carpet analogues?

5 votes
3 answers
474 views

Hard-sphere gases and the wave equation

5 votes
0 answers
569 views

The purview or scope of set theory qua set theory

5 votes
1 answer
821 views

Hurwitz's automorphisms theorem with deformations

5 votes
1 answer
330 views

Triangle theorems and cubic curves

5 votes
1 answer
744 views

Definable map from all the ordinals to the surreal numbers with a dense image?

5 votes
0 answers
285 views

MathJax (or something like it) as a classroom “blackboard”

5 votes
2 answers
339 views

Normal form(s) for the elements of hyperbolic triangle groups

5 votes
0 answers
278 views

Limits of $p/\ln p - q /\ln q$, $p, q$ prime

5 votes
1 answer
221 views

A variation on Pisot–Vijayaraghavan numbers

5 votes
1 answer
432 views

Cofinality of countable ordinals in ZF, and in toposes