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Dan Petersen's user avatar
Dan Petersen's user avatar
Dan Petersen
  • Member for 13 years, 7 months
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All Questions Answers
Score Newest
answer
84
Examples where it's useful to know that a mathematical object belongs to some family of objects
Sep 1, 2011
answer
71
Structures that turn out to exhibit a symmetry even though their definition doesn't
Dec 14, 2013
answer
67
Can the fundamental group of any manifold be realized as the fund grp of a finite space?
Nov 10, 2010
question
50
What (if anything) unifies stable homotopy theory and Grothendieck's six functors formalism?
Jun 8, 2014
answer
47
Ring-theoretic characterization of open affines?
Apr 8, 2010
answer
47
Most memorable titles
Oct 31, 2010
answer
42
How did the refereeing system of Gösta Mittag-Leffler's Acta Mathematica function from 1882 to (about) 1918?
Jul 12, 2017
answer
41
Elementary proof that $\mathbb{R}^3 \setminus \{p_1,\dots,p_n\}$ is not homeomorphic to $\mathbb{R}^3$
Jan 6, 2021
answer
38
What does the term "yoga" mean in mathematics?
May 6, 2011
answer
37
What is a triangle?
Dec 18, 2016
Top Meta posts
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When a MSE user is suspended, should the suspension apply to MO as well?
8
Why do they think this question is not of research level?
7
Some users have lost their username
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Help cleanup tags!
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Why do mathematicians use single-letter variables?
75
How to prove that a polynomial of degree $n$ has at most $n$ roots?
35
Does $\zeta(3)$ have a connection with $\pi$?
25
Are there any non-constructive proofs for which an example was never constructed?
25
The myth of no prime formula?

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