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25 votes
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Can I ask a question on MathOverflow and also on another site?

Cross-posting is discouraged in general, because it can lead to duplication of effort by people answering on different sites. However, it is appropriate under some circumstances. Most of the advice ...
Tim Campion's user avatar
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21 votes

Best of MathOverflow, or papers inspired by MathOverflow

My MO question Conjugation of group extensions was answered by YCor. As a result, we wrote a joint note Conjugate complex homogeneous spaces with non-isomorphic fundamental groups published in C. R. ...
14 votes

Best of MathOverflow, or papers inspired by MathOverflow

A nice question by Michael Hardy, How many rearrangements must fail to alter the value of a sum before you conclude that none do?, led to a recent 6-author collaboration, 5 or 6 of whom are MO patrons ...
11 votes

Best of MathOverflow, or papers inspired by MathOverflow

In 2013 John Pardon solved the Hilbert-Smith conjecture for group actions on 3-manifolds. Lemma 2.17 of the paper was based on the answer to this mathoverflow question. I was quite surprised to ...
11 votes

Best of MathOverflow, or papers inspired by MathOverflow

Mohammad Ghomi answered the question Shortest closed curve to inspect a sphere, in a paper, Shortest closed curve to inspect a sphere, posted to the arXiv (https://arxiv.org/abs/2010.15204), whose PDF ...
11 votes

Best of MathOverflow, or papers inspired by MathOverflow

The MO question, "Shortest closed curve to inspect a sphere," was cited as the "initial stimulus" for the paper Mohammad Ghomi, "The length, width,and inradius of space curves," (PDF download.) ...
10 votes

Best of MathOverflow, or papers inspired by MathOverflow

Hannah Cairns's proof of Perron's theorem (discussed in this MathOverflow question) has been published in The American Mathematical Monthly as Perron’s Theorem in an Hour.
10 votes

Best of MathOverflow, or papers inspired by MathOverflow

The full answer to the question Decidability of diophantine equation in a theory by rainmaker in the case of Robinson’s arithmetic was written up in my paper Division by zero, Archive for Mathematical ...
10 votes

Best of MathOverflow, or papers inspired by MathOverflow

An unpublished open problem posed by Adam Chalcraft, Does every polyomino tile $\mathbb R^n$ for some $n$?, received considerable attention when I posted it here on MO. (Of all the questions that I ...
10 votes

Best of MathOverflow, or papers inspired by MathOverflow

Not sure if my recent paper "Equivalence: an attempt at a history of the idea" qualifies as one of the "best of Mathoverflow or papers inspired by Mathoverflow". But I am sure Mathoverflow was a force ...
9 votes

Best of MathOverflow, or papers inspired by MathOverflow

Julien Marché's question "Homology generated by lifts of simple curves" was the first appearance in print of a folklore question (I first was asked it back when I was a postdoc). As I discuss in my ...
8 votes

Best of MathOverflow, or papers inspired by MathOverflow

My Forum of Mathematics Sigma paper (published 2021) answered a 20-year old question of Jeff Shallit. The proof makes crucial use of ideas in a 2016 MO answer by Anthony Quas.
8 votes

Best of MathOverflow, or papers inspired by MathOverflow

Joachim König has answered my question Order of products of elements in symmetric groups in his paper A note on the product of two permutations of prescribed orders, to appear in European Journal of ...
7 votes

Best of MathOverflow, or papers inspired by MathOverflow

This paper addresses and partially solves a question posed by Matthew Kahle, whose MO question they explicitly cite: chromatic number of the hyperbolic plane. DeCorte, Evan, and Konstantin Golubev....
7 votes

Best of MathOverflow, or papers inspired by MathOverflow

The paper "Majority colourings of digraphs" by Paul Seymour, Stephan Kreutzer, Sang-il Oum, David R. Wood and myself has its origin in my question "Majority coloring for directed graphs".
7 votes

Best of MathOverflow, or papers inspired by MathOverflow

This paper of mine (Arithmetic Restrictions on Geometric Monodromy) was inspired in large part by this question asked by Lisa S., though the original motivation is not so obvious in the final product.
7 votes

Best of MathOverflow, or papers inspired by MathOverflow

The discussion initiated by my question Primes occurring as orders of elements of a finitely presented group led to the addition of Section 5 to: Maurice Chiodo, On torsion in finitely presented ...
7 votes

Best of MathOverflow, or papers inspired by MathOverflow

Leonardo Zapponi has answered my question Parametric solutions of Pell's equation in his paper Parametric solutions of Pell equations.
7 votes

Best of MathOverflow, or papers inspired by MathOverflow

Quoting Oscar Cunningham's answer to an MO question asking for decision problems that are not known to be decidable: In Conway's Game of Life, the problem of deciding whether a given pattern with ...
7 votes

Best of MathOverflow, or papers inspired by MathOverflow

This doesn't quite fit the mold of the other postings, but Matt Parker (Numberphile and StandUpMaths) made a YouTube video that mentions MathOverflow several times, and particularly highlights the ...
6 votes

Best of MathOverflow, or papers inspired by MathOverflow

Zhi-Wei Sun posted a highly upvoted MO question in 2018, Can we write each positive rational number as ${1\over p_1−1}+\cdots+{1\over p_k−1}$ with $p_1,\ldots,p_k$ distinct primes? The question ...
6 votes

Best of MathOverflow, or papers inspired by MathOverflow

I just learned that a question of mine on minimal vertex covers in hypergraphs where edges intersect in at most $1$ point led to a paper by Lajos Soukup and Tamas Csernak; it will appear in Discrete ...
6 votes

Best of MathOverflow, or papers inspired by MathOverflow

Garabed Gulbenkian's 2010 question about ordinal definable real numbers, which Joel David Hamkins called "a fascinating, outstanding question," attracted considerable attention, culminating ...
6 votes

Best of MathOverflow, or papers inspired by MathOverflow

The paper, "A quantitative obstruction to collapsing surfaces," by Mikahil G. Katz, arXiv abs, addresses the MO question, "Gromov-Hausdorff limits of 2-dimensional Riemannian surfaces" posed by sva (S....
6 votes

Best of MathOverflow, or papers inspired by MathOverflow

This MO question "Property $\Gamma$ in terms of correspondences" led us to answer two old open problems and to push further a third more recent result: Jon Bannon, Amine Marrakchi, Narutaka Ozawa. ...
5 votes

Best of MathOverflow, or papers inspired by MathOverflow

Ilya Bogdanov has answered my question Graphs with only disjoint perfect matchings on certain coloring in graphs, that emerged through research in quantum physics. This answer has inspired quite a ...
4 votes

Best of MathOverflow, or papers inspired by MathOverflow

Beginning with discussions in MO, it was proved that the Apéry sequence is a Stieltjes moment sequence. My final streamlined argument for this was posted to the arxiv in 2020: LINK
4 votes

Best of MathOverflow, or papers inspired by MathOverflow

In response to an MO question, On maximal regular polyhedra inscribed in a regular polyhedron, Moritz Firsching filled in the missing cases from H.T. Crofts original paper on the topic. He then posted ...
4 votes

Best of MathOverflow, or papers inspired by MathOverflow

A paper by T. Chartier, P.P. Pach and myself describing the status of "Can we color Z^+ with n colors such that a, 2a, …, na all have different colors for all a?" has just been published. ...

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