David Speyer

54,944

Reputation

22542 views

Registered User

Name	David Speyer
Member for	3 years
Seen	15 hours ago
Website	math.lsa.umich.edu/~speyer
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.

stats recent reputation favorites

60

Questions

votes newest views recent

24

45

votes

3

answers

3k

views

Is there a “Basic Number Theory” for elliptic curves?

nt.number-theory elliptic-curves zeta-functions birch-swinnerton-dyer

aug 10 11 at 6:10 Will Jagy 12.5k●1●26●45

36

37

votes

7

answers

5k

views

What is Lagrange Inversion good for?

mathematics-education co.combinatorics generating-functions

oct 1 at 3:16 Tom Copeland 805●5●20

9

23

votes

4

answers

1k

views

Do Abel summation and zeta summation always coincide?

divergent-series ca.analysis-and-odes

apr 30 10 at 19:55 Brad Rodgers 970●6●13

10

23

votes

5

answers

2k

views

What is known about this plethysm?

co.combinatorics rt.representation-theory

mar 28 12 at 20:23 Maxim Leyenson 123●5

11

21

votes

3

answers

1k

views

What is the right version of “partitions of unity implies vanishing sheaf cohomology”

sheaf-theory cohomology ag.algebraic-geometry partition-of-unity locally-ringed-spaces

feb 2 10 at 16:54 David Speyer 54.9k●3●102●236

8

20

votes

0

answers

702

views

Is there software to compute the cohomology of an affine variety?

ag.algebraic-geometry at.algebraic-topology mathematical-software

nov 16 11 at 21:17 David Speyer 54.9k●3●102●236

6

19

votes

2

answers

709

views

Direct proof that the centralizer of $GL(V)$ acting on $V^{\otimes n}$ is spanned by $S_n$

rt.representation-theory schur-functors teaching

mar 6 12 at 18:32 darij grinberg 12.6k●1●24●75

4

19

votes

2

answers

1k

views

Is there a 7-regular graph on 50 vertices with girth 5? What about 57-regular on 3250 vertices?

graph-theory co.combinatorics design-theory open-problem

jan 30 12 at 17:33 Aaron Meyerowitz 11.5k●1●10●31

11

19

votes

3

answers

1k

views

Can assignment solve stable marriage?

co.combinatorics algorithms graph-theory

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

12

19

votes

4

answers

1k

views

Rolling without slipping interpretation of torsion

dg.differential-geometry torsion connections

jan 31 11 at 8:39 Four Organs 11●1

716

Answers

votes newest views recent

Most memorable titles

What should be learned in a first serious schemes course? (3)

Applications of the Chinese remainder theorem (3)

Why do primes dislike dividing the sum of all the preceding primes?

Invertible matrices of natural numbers are permutations… why?

Examples where it’s useful to know that a mathematical object belongs to some family of objects (3)

Why Mertens could not prove the prime number theorem?

Irreducibility of polynomials in two variables

What is the Hirzebruch-Riemann-Roch formula for the flag variety of a Lie algebra?

Is no proof based on “tertium non datur” sufficient any more after Gödel?

What should be offered in undergraduate mathematics that’s currently not (or isn’t usually)?

$\prod_{n=1}^{\infty} n{}^{\mu(n)}=\frac{1}{4 \pi ^2}$

Generating a finite group from elements in each conjugacy class

Examples of common false beliefs in mathematics. (3)

Open problems with monetary rewards

Are the Millennium Prize Problems all decidable?

Chain homotopy: Why du+ud and not du+vd? (2)

Strengthening the Induction Hypothesis

What would you want on a Lie theory cheat poster? (2)

When is the product of two ideals equal to their intersection?

Character table does not determine group Vs Tannaka duality

Calculating the “Most Helpful” review

Can algebraic varieties be rigidified by finite sets of points? (2)

Expected determinant of a random NxN matrix.

Recovering representation from its character

$Q(\sqrt{2})=Q((\sqrt{2}+1)^n)$

Non-Diagonalizable Doubly Stochastic Matrices

Analogue of the Chebyshev polynomials over C?

f(f(x))=exp(x)-1 and other functions “just in the middle” between linear and exponential. (2)

“Are you more intelligent than the average of those who are more intelligent than the average?”

8848

Votes

8718

130

342

Tags

ag.algebraic-geometry× 180
nt.number-theory× 109
co.combinatorics× 72
ac.commutative-algebra× 50
rt.representation-theory× 49
linear-algebra× 42
gr.group-theory× 41
matrices× 27
dg.differential-geometry× 27
reference-request× 26

ra.rings-and-algebras× 25
at.algebraic-topology× 25
polynomials× 23
graph-theory× 23
pr.probability× 22
ca.analysis-and-odes× 21
complex-geometry× 20
soft-question× 19
lo.logic× 18
ct.category-theory× 17

lie-groups× 15
prime-numbers× 14
lie-algebras× 14
cv.complex-variables× 14
algebraic-number-theory× 14
algebraic-groups× 14
set-theory× 12
homological-algebra× 12
cohomology× 12
big-list× 12

analytic-number-theory× 12
zeta-functions× 10
gn.general-topology× 10
geometry× 10
galois-theory× 10
elliptic-curves× 10
algebraic-curves× 10
vector-bundles× 9
number-fields× 9
finite-fields× 9

examples× 8
characteristic-p× 8
algorithms× 8
sg.symplectic-geometry× 7
fourier-analysis× 7
finite-groups× 7
convex-polytopes× 7
computer-algebra× 7
class-field-theory× 7
toric-varieties× 6

341

Badges