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David E Speyer's user avatar
David E Speyer's user avatar
David E Speyer
  • Member for 14 years, 6 months
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About

Professor of Mathematics at the University of Michigan. My research interests are in combinatorial algebraic geometry, particularly Schubert calculus, matroids and cluster algebras. I also enjoy thinking about number theory and computational mathematics.

Disclaimer: I have 10 years of answers on MO. I do not feel obliged to respond to every comment I get.

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Top posts
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answer
167
Most memorable titles
Oct 31, 2010
answer
128
Why do primes dislike dividing the sum of all the preceding primes?
Feb 1, 2013
question
116
How did Cole factor $2^{67}-1$ in 1903?
May 22, 2015
answer
109
Invertible matrices of natural numbers are permutations... why?
Apr 18, 2011
answer
100
Irreducibility of polynomials in two variables
Feb 3, 2010
answer
87
$\prod_{n=1}^{\infty} n^{\mu(n)}=\frac{1}{4 \pi ^2}$
Mar 12, 2013
answer
83
Why could Mertens not prove the prime number theorem?
May 2, 2012
answer
77
Conceptual reason why the sign of a permutation is well-defined?
Mar 8, 2022
question
74
What is Lagrange Inversion good for?
Jul 16, 2010
answer
72
Applications of the Chinese remainder theorem
Dec 29, 2009
Top Meta posts
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31
What is our policy on asking about correctness of preprints?
29
Policy toward GPT-generated conjectures?
27
What are our procedures if a user complains about harassment or abuse?
26
At what point should MO recognise it needs to leave Stack Exchange Inc?
23
Request to keep an eye out for PROMYS admissions problems
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203
Evaluate $\int_0^1 \frac{\log \left( 1+x^{2+\sqrt{3}}\right)}{1+x}\mathrm dx$
181
How to find the Galois group of a polynomial?
101
Convergence of $\sqrt{n}x_{n}$ where $x_{n+1} = \sin(x_{n})$
99
Advantages of Mathematics competition/olympiad students in Mathematical Research
86
Different ways to prove $\sum_{k=1}^\infty \frac{1}{k^2}=\frac{\pi^2}{6}$ (the Basel problem)