Reid Barton

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Name Reid Barton
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Seen May 6 at 22:20
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Order of an automorphism of a finite group

oct 18 09 at 21:24 Greg Stevenson 5,538●1●16●20

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Semiadditivity and dualizability of 2

apr 14 10 at 5:15 Daniel Schäppi 816●6●4

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How should we define “locally small”?

oct 30 09 at 19:09 Reid Barton 14.4k●1●28●85

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cardinality of final coalgebras in Top

oct 20 09 at 16:28 Tom Leinster 13.5k●1●40●82

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algebraic K-theory and tensor products

mar 15 at 13:21 V. Srinivas 236●2●3

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165

Answers
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31
Is there a “universal group object”? (answered: yes!)
28
Analogue to covering space for higher homotopy groups?
27
Computing the structure of the group completion of an abelian monoid, how hard can it be?
26
why haven’t certain well-researched classes of mathematical object been framed by category theory?
25
Can a topos ever be an abelian category?
24
why is it so cool to square numbers? (in terms of finding the standard deviation)
23
Is every finite group a group of “symmetries”?
23
Example of a good Zero Knowledge Proof.
21
What is the definition of “canonical” ?
21
Why does non-abelian group cohomology exist?
21
How do you keep your research notes organized?
19
What’s a groupoid? What’s a good example of a groupoid?
19
What is (co)homology, and how does a beginner gain intuition about it?
19
Why do I find Category Theory mostly just a way to make simple things difficult?
18
Describe a topic in one sentence.
18
Countable subgroups of compact groups
18
Are there two non-homotopy equivalent spaces with equal homotopy groups?
18
Most interesting mathematics mistake?
18
How Does One Find the “Loneliest Person on the Planet”?
18
Why are spectral sequences so ubiquitous?
17
Presheaves as limits of representable functors?
16
Least number of charts to describe a given manifold
16
What’s a reasonable category that is not locally small?
16
Is it possible to capture a sphere in a knot?
16
Functorial Whitehead Tower?
15
Two finite groups with the same identical relations?
14
Representablity of Cohomology Ring
14
Homotopy pullbacks and homotopy pushouts
14
Colimits in the category of smooth manifolds
14
Mathematical solution for a two-player single-suit trick taking game?
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