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John Baez's user avatar
John Baez's user avatar
John Baez's user avatar
John Baez
  • Member for 13 years, 10 months
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About

I'm a mathematical physicist. I have a lot of expository material on math and physics on my website, and you can follow me on Twitter. I used to work on n-categories and fundamental physics, but now I'm thinking about network theory and environmental problems.

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115
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11
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Top posts
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All Questions Answers
Score Newest
question
94
Quasicrystals and the Riemann Hypothesis
Jun 13, 2013
question
79
Which finite abelian groups aren't homotopy groups of spheres?
Nov 26, 2020
question
61
Bourbaki's definition of the number 1
Apr 14, 2020
answer
57
Is Lebesgue's "universal covering" problem still open?
Dec 6, 2013
question
55
Do unit quaternions at vertices of a regular 4-simplex, one being 1, generate a free group?
May 1, 2015
question
48
How many ways can you inscribe five 24-cells in a 600-cell, hitting all its vertices?
Dec 14, 2017
answer
45
Why do Bernoulli numbers arise everywhere?
Apr 11, 2011
question
39
What are the main structure theorems on finitely generated commutative monoids?
May 19, 2013
answer
39
Why is conformal invariance only possible for massless theories?
May 18, 2017
question
37
Is there a $c > 1$ such that for all $n \ge 1$ the largest integer $\le c^n$ is prime?
Dec 13, 2022
Top network posts
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24
Sequence with convergent subnets but no convergent subsequences
18
Why is nitrogen (with 7 protons and 7 neutrons) so much more abundant than any other odd-odd isotope?
14
Implementing Category Theory in General Relativity
13
When is the ring homomorphism $\mathbb{Z} \to R$ an epimorphism?
10
Who predicted the existence of the muon neutrino?

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