User Bjorn Poonen

21 votes

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A two-variable Fourier series and a strange integral

answered Feb 20, 2010 at 19:40

20 votes

Are there any books that take a 'theorems as problems' approach?

answered Jan 31, 2010 at 4:06

20 votes

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Question about polynomials with coefficients in Z

answered Jan 22, 2010 at 1:54

20 votes

Irreducible polynomials with constrained coefficients

answered Dec 27, 2009 at 0:29

20 votes

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Fields of definition of a variety

answered Mar 27, 2010 at 8:59

19 votes

Fields of definition of a variety

answered Mar 27, 2010 at 9:59

18 votes

Using Weierstrass’s Factorization Theorem

answered Feb 27, 2010 at 1:37

18 votes

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What are examples illustrating the usefulness of Krull (i.e., rank > 1) valuations?

answered Jan 19, 2010 at 6:15

18 votes

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Two rings...are they isomorphic?

answered Nov 12, 2014 at 3:34

18 votes

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Disjoint images of polynomials

answered Nov 13, 2014 at 23:08

18 votes

Isomorphism problem for commutative algebras and schemes.

answered Apr 19, 2010 at 21:10

17 votes

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Are automorphism groups of hypersurfaces reduced ?

answered Jan 5, 2010 at 1:07

16 votes

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Spheres over rational numbers and other fields

answered Feb 17, 2010 at 2:32

16 votes

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What's the Hilbert class field of an elliptic curve?

answered Feb 22, 2010 at 2:46

16 votes

Where to publish computer computations

answered Mar 7, 2010 at 6:12

15 votes

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Serre duality and low dimensional cohomology groups

answered Feb 14, 2010 at 17:31

15 votes

Variants of Waring's problem

answered Jan 22, 2010 at 2:28

15 votes

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Factorization of an irreducible polynomial in the field extension it defines

answered Apr 9, 2022 at 4:33

14 votes

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What are the normal subgroups of a direct product?

answered May 6, 2010 at 11:50

14 votes

A graph on irrationals where p is adjacent to q if p^q or q^p is rational.

answered Apr 6, 2010 at 9:50

14 votes

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How to solve Diophantine equations in $F_{p}$?

answered Apr 6, 2010 at 21:45

14 votes

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Waring's problem for matrices

answered Apr 10, 2010 at 0:27

14 votes

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How to characterize Abelian sheaves that are quasi-coherent?

answered Mar 25, 2010 at 22:58

13 votes

Which finitely presented groups can be distinguished by decidable properties?

answered Mar 5, 2010 at 4:51

13 votes

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calculating the genus of a curve using the Newton polygon

answered Feb 27, 2010 at 16:16

13 votes

Finite interpolation by a nondecreasing polynomial

answered Feb 28, 2010 at 16:45

13 votes

alternative construction of the quotient group

answered Feb 7, 2010 at 18:00

13 votes

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Proving that any two points on a variety can be joined by a curve; why does Bertini apply?

answered Nov 8, 2014 at 1:07

12 votes

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longest consecutive subsequence of a random permutation

answered May 6, 2010 at 5:19

12 votes

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distribution of degree of minimum polynomial for eigenvalues of random matrix with elements in finite field

answered Apr 3, 2010 at 13:30

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95 Answers

A two-variable Fourier series and a strange integral

Are there any books that take a 'theorems as problems' approach?

Question about polynomials with coefficients in Z

Irreducible polynomials with constrained coefficients

Fields of definition of a variety

Fields of definition of a variety

Using Weierstrass’s Factorization Theorem

What are examples illustrating the usefulness of Krull (i.e., rank > 1) valuations?

Two rings...are they isomorphic?

Disjoint images of polynomials

Isomorphism problem for commutative algebras and schemes.

Are automorphism groups of hypersurfaces reduced ?

Spheres over rational numbers and other fields

What's the Hilbert class field of an elliptic curve?

Where to publish computer computations

Serre duality and low dimensional cohomology groups

Variants of Waring's problem

Factorization of an irreducible polynomial in the field extension it defines

What are the normal subgroups of a direct product?

A graph on irrationals where p is adjacent to q if p^q or q^p is rational.

How to solve Diophantine equations in $F_{p}$?

Waring's problem for matrices

How to characterize Abelian sheaves that are quasi-coherent?

Which finitely presented groups can be distinguished by decidable properties?

calculating the genus of a curve using the Newton polygon

Finite interpolation by a nondecreasing polynomial

alternative construction of the quotient group

Proving that any two points on a variety can be joined by a curve; why does Bertini apply?

longest consecutive subsequence of a random permutation

distribution of degree of minimum polynomial for eigenvalues of random matrix with elements in finite field