Linked Questions

61 votes
11 answers
21k views

What are some open problems in algebraic geometry?

What are the open big problems in algebraic geometry and vector bundles? More specifically, I would like to know what are interesting problems related to moduli spaces of vector bundles over ...
35 votes
8 answers
3k views

Examples of integer sequences coincidences

For the time being, the OEIS website contains almost $300000$ sequences. Each of these sequences is the mark of a specific mathematical concept. Sometimes two (or more) distinct concepts have the ...
29 votes
4 answers
5k views

Good uses of Siegel zeros?

The short version of my question goes: What is known to follow from the existence of Siegel zeros? A longer version to give an idea of what I have in mind: The "exceptional zeros" of course first ...
Kálmán Kőszegi's user avatar
30 votes
3 answers
3k views

Can there be an embedding j:V → L, from the set-theoretic universe V to the constructible universe L, when V ≠ L?

Main Question. Can there be an embedding $j:V\to L$ of the set-theoretic universe $V$ to the constructible universe $L$, if $V\neq L$? By embedding here, I mean merely a proper class isomorphism from $...
Joel David Hamkins's user avatar
42 votes
1 answer
3k views

Complex vector bundles that are not holomorphic

Is there an example of a complex bundle on $\mathbb CP^n$ or on a Fano variety (defined over complex numbers), that does not admit a holomorphic structure? We require that the Chern classes of the ...
Dmitri Panov's user avatar
  • 28.9k
28 votes
2 answers
2k views

Has anyone seen a nice map of multiplicative cohomology theories?

I have seen lots of descriptions of this map in the literature but never seen it nicely drawn anywhere. I could try to do it myself but I really lack expertise, hence am afraid to miss something or ...
მამუკა ჯიბლაძე's user avatar
19 votes
1 answer
2k views

Where does the "Hardy-Littlewood" conjecture that pi(x+y) < pi(x) + pi(y) originate?

The conjecture that $\pi(x+y) \leq \pi(x) + \pi(y)$, with $\pi$ the counting function for prime numbers, is customarily attributed to Hardy and Littlewood in their 1923 paper, third in the Partitio ...
T..'s user avatar
  • 3,631
3 votes
1 answer
994 views

Whence the k-tuple conjecture?

What is the source of the $k$-tuple conjecture, that every integer tuple $(k_1,\ldots,k_n)$ either contains all members of a congruence class mod a prime or has infinitely many primes amongst $(k_1+c,\...
Charles's user avatar
  • 9,114
1 vote
1 answer
631 views

Computability of prime difference function

Consider the following function $f: \omega\to \{0,1\}$: Set $f(n) = 1$ if for all $k\in \omega$ there are prime numbers $p,q > k$ such that $n = p-q$, and set $f(n) = 0$ otherwise. (Trivially, ...
Dominic van der Zypen's user avatar
1 vote
0 answers
253 views

Who formulated the conjecture that the set of real parts of zeros of the Riemann zeta function is dense in $[0,1]$?

Does anyone know who formulated this conjecture related to Riemann's zeta function? Conjecture. The set $$\{ x : \exists y \space \space \zeta (x+iy) = 0\}$$ is dense in $[0, 1]$. In ...
Cristian Dumitrescu's user avatar