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Dan Petersen's user avatar
Dan Petersen's user avatar
Dan Petersen
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86
Examples where it's useful to know that a mathematical object belongs to some family of objects
Sep 1, 2011
72
Structures that turn out to exhibit a symmetry even though their definition doesn't
Dec 14, 2013
68
Can the fundamental group of any manifold be realized as the fund grp of a finite space?
Nov 10, 2010
50
What (if anything) unifies stable homotopy theory and Grothendieck's six functors formalism?
Jun 8, 2014
50
Ring-theoretic characterization of open affines?
Apr 8, 2010
48
Most memorable titles
Oct 31, 2010
42
How did the refereeing system of Gösta Mittag-Leffler's Acta Mathematica function from 1882 to (about) 1918?
Jul 12, 2017
41
Elementary proof that $\mathbb{R}^3 \setminus \{p_1,\dots,p_n\}$ is not homeomorphic to $\mathbb{R}^3$
Jan 6, 2021
39
What does the term "yoga" mean in mathematics?
May 6, 2011
38
The "derived drift" is pretty unsatisfying and dangerous to category theory (or at least, to me)
Dec 26, 2017
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When a MSE user is suspended, should the suspension apply to MO as well?
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Why do they think this question is not of research level?
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Some users have lost their username
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Help cleanup tags!
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Why do mathematicians use single-letter variables?
87
How to prove that a polynomial of degree $n$ has at most $n$ roots?
35
Does $\zeta(3)$ have a connection with $\pi$?
26
Are there any non-constructive proofs for which an example was never constructed?
26
The myth of no prime formula?