David Speyer

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Name David Speyer
Member for 3 years
Seen 5 hours ago
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Location Ann Arbor
Age 32
I am a professor at the University of Michigan. I work in combinatorics and algebraic geometry; I think a lot about cluster algebras, matroids and classical algebraic geometry. I enjoy thinking about number theory, although it is not a research interest of mine.
61

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What is known about this plethysm?

mar 28 12 at 20:23 Maxim Leyenson 133●5

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A double grading of catalan numbers

may 28 at 13:52 David Speyer 56.3k●3●103●242

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Can assignment solve stable marriage?

nov 15 10 at 0:05 Sergey Norin 2,045●8●11

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Answers
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96
What should be learned in a first serious schemes course? (3)
95
Most memorable titles
85
Applications of the Chinese remainder theorem (3)
77
Why do primes dislike dividing the sum of all the preceding primes?
71
Invertible matrices of natural numbers are permutations… why?
55
Examples where it’s useful to know that a mathematical object belongs to some family of objects (3)
49
Why Mertens could not prove the prime number theorem?
48
Irreducibility of polynomials in two variables
41
What is the Hirzebruch-Riemann-Roch formula for the flag variety of a Lie algebra?
40
Is no proof based on “tertium non datur” sufficient any more after Gödel?
39
What should be offered in undergraduate mathematics that’s currently not (or isn’t usually)?
39
Generating a finite group from elements in each conjugacy class
38
$\prod_{n=1}^{\infty} n{}^{\mu(n)}=\frac{1}{4 \pi ^2}$
36
Examples of common false beliefs in mathematics. (3)
34
Open problems with monetary rewards
33
Are the Millennium Prize Problems all decidable?
33
Chain homotopy: Why du+ud and not du+vd? (2)
29
Strengthening the Induction Hypothesis
28
What would you want on a Lie theory cheat poster? (2)
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When is the product of two ideals equal to their intersection?
26
Character table does not determine group Vs Tannaka duality
26
Calculating the “Most Helpful” review
26
Can algebraic varieties be rigidified by finite sets of points? (2)
25
Expected determinant of a random NxN matrix.
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Recovering representation from its character
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$Q(\sqrt{2})=Q((\sqrt{2}+1)^n)$
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Non-Diagonalizable Doubly Stochastic Matrices
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Analogue of the Chebyshev polynomials over C?
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f(f(x))=exp(x)-1 and other functions “just in the middle” between linear and exponential. (2)
21
“Are you more intelligent than the average of those who are more intelligent than the average?”
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