Greg Kuperberg's user avatar
Greg Kuperberg's user avatar
Greg Kuperberg's user avatar
Greg Kuperberg
  • Member for 14 years, 5 months
  • Last seen this week
20 votes
Accepted

No simple groups of order 720?

20 votes
Accepted

What is the best homology/cohomology theory for the Lefschetz fixed point theorem?

19 votes
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Complexity of a weirdo two-dimensional sorting problem

19 votes

What are D-branes, really?

19 votes
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Database of Steiner triple systems

19 votes
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Binomial supercongruences: is there any reason for them?

19 votes

When are modules and representations not the same thing?

19 votes
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Where can I find the text of Weyl's Fields Medal speech for Serre?

18 votes

Basis of l^infinity

18 votes
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Combinatorics of the Stasheff polytopes

18 votes

Open problems in Euclidean geometry?

17 votes
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Understanding "infinite" relations in groups

17 votes

Doubly stochastic matrices as squares of entires of unitary matrices

17 votes
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Classification of finite commutative rings

17 votes
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Embeddings of $S^2$ in $\mathbb{CP}^2$

17 votes

Curriculum reform success stories at an "average" research university

17 votes

Why is there no Cayley's Theorem for rings?

16 votes
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*-homomorphisms between matrix algebras

16 votes

Intuition behind Alexander duality

16 votes

Does a finite-dimensional Lie algebra always exponentiate into a universal covering group

16 votes
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Battleship Permutations

16 votes
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Can $N^2$ have only digits 0 and 1, other than $N=10^k$?

16 votes
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What element of $\pi_2(S^2)$ do rational functions represent?

16 votes

What about the classification of big finite simple groups?

16 votes
Accepted

Triangulating hypercubes

16 votes

Topological dimension versus cohomological dimension

15 votes

When is a TQFT the dimensional reduction of a higher dimensional TQFT?

15 votes

Toy Models of Quantum Mechanics

15 votes

Classification of homology 3-spheres?

15 votes

What is a metric space?

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