User Akhil Mathew

155 votes

1 answer

18k views

What's the significance of Tate's thesis?

asked Mar 5, 2011 at 1:47

50 votes

3 answers

8k views

Why does a minimal prime ideal consist of zerodivisors?

asked Jul 22, 2010 at 21:43

44 votes

10 answers

22k views

Fermat's Two Square Theorem: How do you prove that an odd prime is the sum of two squares iff it is congruent to 1 mod 4?

asked Jul 23, 2010 at 17:25

38 votes

3 answers

2k views

Is the $24$ game NP-complete?

asked Jul 24, 2010 at 4:46

23 votes

4 answers

3k views

Why is the cohomology of a $K(G,1)$ group cohomology?

asked Nov 16, 2010 at 1:22

20 votes

2 answers

2k views

Algebraic versus topological line bundles

asked Dec 19, 2010 at 2:16

18 votes

2 answers

1k views

Existence of divisors of degree one on a curve over a finite field

asked Sep 21, 2012 at 23:16

16 votes

2 answers

2k views

Is the Serre spectral sequence a special case of the Leray spectral sequence?

asked Nov 21, 2010 at 4:43

15 votes

1 answer

1k views

How do you prove that $p(n \xi)$ for $\xi$ irrational and $p$ a polynomial is uniformly distributed modulo 1?

asked Jul 20, 2010 at 21:20

15 votes

1 answer

775 views

Does every Cauchy net of hyperreals converge?

asked Mar 22, 2011 at 4:00

15 votes

2 answers

3k views

Motivation for stable curves

asked May 31, 2012 at 17:10

14 votes

1 answer

480 views

Are projective rings over $\mathbb{Z}$ free?

asked Jan 11, 2012 at 17:04

14 votes

1 answer

1k views

Why do we need noetherianness (or something like it) for Serre's criterion for affineness?

asked Aug 24, 2010 at 2:41

13 votes

2 answers

2k views

Why is Top a model category?

asked Nov 29, 2010 at 0:03

12 votes

1 answer

2k views

Irreducible representations of a tensor product

asked Apr 11, 2012 at 21:41

11 votes

1 answer

566 views

Are homotopic maps over a cofibration homotopic relative to the cofibration?

asked Oct 9, 2010 at 16:05

10 votes

1 answer

625 views

Bott periodicity and algebraic geometry

asked Oct 23, 2010 at 23:00

10 votes

2 answers

720 views

Examples/other references for EGA 0.4.5.4

asked Aug 1, 2010 at 14:04

10 votes

2 answers

674 views

Degenerations of $\mathbb{P}^1$

asked Mar 18, 2013 at 13:05

10 votes

1 answer

725 views

Isomorphisms in the localization of a category

asked May 24, 2011 at 1:15

10 votes

2 answers

2k views

Class field theory for function fields and a curious statement

asked Jul 4, 2011 at 18:24

9 votes

1 answer

465 views

What's the map $BU \times \mathbb{Z} \to \prod K(\mathbb{Z},n)$ representing the total Chern class?

asked Dec 17, 2010 at 13:34

8 votes

1 answer

282 views

Do cokernels in RingSpc automatically lead to descent?

asked Sep 5, 2010 at 2:28

8 votes

2 answers

295 views

Why is $\pi_* MU$ concentrated in even degrees?

asked Dec 29, 2011 at 4:27

8 votes

1 answer

2k views

Homotopy/homology groups of the smash product of spectra

asked Dec 31, 2011 at 2:11

6 votes

1 answer

512 views

What do coherent topoi have to do with completeness?

asked Jun 16, 2011 at 1:49

6 votes

2 answers

651 views

How to show that you can find two subspaces that don't intersect

asked Oct 3, 2010 at 0:09

6 votes

1 answer

682 views

How to get the connectedness theorem from the quasi-finite version of ZMT?

asked Dec 24, 2010 at 22:39

5 votes

1 answer

349 views

Does contractibility imply contractibility with a basepoint?

asked Sep 13, 2010 at 12:11

5 votes

2 answers

550 views

Excision via simplicial sets

asked Jun 15, 2011 at 2:19

Stack Exchange Network

37 Questions

What's the significance of Tate's thesis?

Why does a minimal prime ideal consist of zerodivisors?

Fermat's Two Square Theorem: How do you prove that an odd prime is the sum of two squares iff it is congruent to 1 mod 4?

Is the $24$ game NP-complete?

Why is the cohomology of a $K(G,1)$ group cohomology?

Algebraic versus topological line bundles

Existence of divisors of degree one on a curve over a finite field

Is the Serre spectral sequence a special case of the Leray spectral sequence?

How do you prove that $p(n \xi)$ for $\xi$ irrational and $p$ a polynomial is uniformly distributed modulo 1?

Does every Cauchy net of hyperreals converge?

Motivation for stable curves

Are projective rings over $\mathbb{Z}$ free?

Why do we need noetherianness (or something like it) for Serre's criterion for affineness?

Why is Top a model category?

Irreducible representations of a tensor product

Are homotopic maps over a cofibration homotopic relative to the cofibration?

Bott periodicity and algebraic geometry

Examples/other references for EGA 0.4.5.4

Degenerations of $\mathbb{P}^1$

Isomorphisms in the localization of a category

Class field theory for function fields and a curious statement

What's the map $BU \times \mathbb{Z} \to \prod K(\mathbb{Z},n)$ representing the total Chern class?

Do cokernels in RingSpc automatically lead to descent?

Why is $\pi_* MU$ concentrated in even degrees?

Homotopy/homology groups of the smash product of spectra

What do coherent topoi have to do with completeness?

How to show that you can find two subspaces that don't intersect

How to get the connectedness theorem from the quasi-finite version of ZMT?

Does contractibility imply contractibility with a basepoint?

Excision via simplicial sets