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36 votes

Best of MathOverflow, or papers inspired by MathOverflow

This is an old and self-indulgent story; but it was such a charmingly unexpected bonus from my early use of MathOverflow, that I think it deserves to be recorded somewhere (my apologies for its length!...
20 votes

Best of MathOverflow, or papers inspired by MathOverflow

This paper (details below) by Zhen Lin Low and Aaron Mazel-Gee cites not just MO but: This collaboration would not have happened without the ‘Homotopy Theory’ chat room on MathOverflow. arXiv....
19 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. ...
17 votes

How to write a good MathOverflow question?

If you ask a question you're asking a favor (the eventual award of MO-points does not change this fact). This means that you should give the public something in return. The formulation of the question ...
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17 votes

Editing etiquette

Most of the time, the edits that I see on MO are respectfully and tactfully performed and small in scope, and gratefully received by the post's author as improvements. Occasionally though I see flare-...
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  • 50.6k
17 votes
Accepted

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 ...
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  • 49.6k
16 votes

Best of MathOverflow, or papers inspired by MathOverflow

The question whether there is a non surjective bounded linear operator on $\ell_\infty$ that has dense range was answered in this paper by Amir Bahman Nasseri, Gideon Schechtman, Tomasz Tkocz, and me. ...
15 votes

Best of MathOverflow, or papers inspired by MathOverflow

The analog of the famous law of iterated logarithm for maximum eigenvalue of a random Gaussian matrix was asked here. Zeitouni's MO-answer was expanded (after significant effort) to a full answer for ...
15 votes

Best of MathOverflow, or papers inspired by MathOverflow

As acknowledged in my note Explicit additive decomposition of norms on $\mathbb{R}^2$, it was sparked by answers by Noam D. Elkies and Suvrit Sra on MathOverflow Absolute value inequality for complex ...
13 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 ...
12 votes

Best of MathOverflow, or papers inspired by MathOverflow

This MO question was the starting point for a joint work with Tao Mei where we study radial multipliers on the von Neumann algebras of hyperbolic groups. The paper is entitled Complete boundedness of ...
12 votes

Best of MathOverflow, or papers inspired by MathOverflow

Keith Kearnes, together with co-authors Emil Kiss and Ágnes Szendrei, recently published a solution to Varieties where every algebra is free in this arxiv preprint. They prove a result under an ...
11 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 ...
11 votes

Best of MathOverflow, or papers inspired by MathOverflow

The question, "How hard is reconstructing a permutation from its differences sequence?" posed by Mohammad Al-Turkistany, was answered by Marzio De Biasi, who then wrote a paper, "Permutation ...
11 votes

Best of MathOverflow, or papers inspired by MathOverflow

According to Christian Stump, his paper "On a New Collection of Words in the Catalan Family" (Journal of Integer Sequences, vol. 17 (2014), article 14.7.1) is a long version of his answers to a ...
11 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.
11 votes

How to write a good MathOverflow question?

MO seems to be a place where a differential geometer may ask about general topological manifolds, a topologist about algebra, etc. (and everybody would love to ask about logic if they were not afraid :...
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10 votes

Best of MathOverflow, or papers inspired by MathOverflow

This paper, Roman Karasev, Jan Kynčl, Pavel Paták, Zuzana Safernová, and Martin Tancer. "Bounds for Pach's selection theorem and for the minimum solid angle in a simplex." arXiv:1403.8147 (2014). ...
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

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 ...
10 votes
Accepted

Best way to post graphics to MO

Put a line of the form ![Text to be shown if the picture is unavailable][1] at the place in your post where the graphics should appear, put the graphics online ...
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  • 18k
9 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 ...
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 ...
9 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.) ...
9 votes

Best of MathOverflow, or papers inspired by MathOverflow

Stefan Kiefer and Björn Wachter just published a paper, "Stability and Complexity of Minimising Probabilistic Automata" (arXiv link), which acknowledges the MO question convex polyhedron in the unit ...
8 votes

Best of MathOverflow, or papers inspired by MathOverflow

The answer to the question Length of Hirzebruch continued fractions was published as a short note On continued fractions of equal length .
8 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 ...
8 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 ...

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