User Ralph

42 votes

4 answers

8k views

Verifying the correctness of a Sudoku solution

asked Apr 29, 2013 at 19:15

28 votes

1 answer

850 views

Is there a Kan-Thurston theorem for fibrations ?

asked Jan 31, 2012 at 14:28

20 votes

1 answer

961 views

Which spaces are characterized by functions with compact support ?

asked Mar 22, 2012 at 0:19

20 votes

1 answer

2k views

Axiom of choice and bases of vector spaces over a fixed field

asked Jun 27, 2011 at 18:11

20 votes

1 answer

3k views

Meaning of 'alternating' group ?

asked Aug 31, 2011 at 23:18

16 votes

1 answer

4k views

Minimal primes and zero-divisors

asked Jun 9, 2011 at 21:30

15 votes

0 answers

698 views

Bloch-Kato conjecture and Wiles' numerical criterion

asked Jun 18, 2012 at 18:48

15 votes

2 answers

1k views

Categories where projective objects are flat

asked Feb 13, 2013 at 22:59

14 votes

4 answers

2k views

Applications of Govorov-Lazard Theorem?

asked Apr 16, 2013 at 23:16

12 votes

2 answers

716 views

Classifying spaces of a profinite groups

asked May 3, 2012 at 19:58

11 votes

1 answer

778 views

Is the dual of the product of infinite cyclic groups a free abelian group ?

asked Aug 28, 2012 at 23:37

10 votes

1 answer

550 views

Fibrations with isomorphic Leray-Serre spectral sequences and non-isomorphic cohomology ?

asked Jun 25, 2012 at 18:14

10 votes

2 answers

426 views

Classifying space of the unit circle of a valued field

asked May 16, 2012 at 22:37

10 votes

1 answer

3k views

Rings with all modules projective ?

asked Apr 20, 2011 at 21:50

10 votes

1 answer

1k views

Minimal number of cells of a CW complex (up to homotopy)

asked Oct 24, 2012 at 23:13

9 votes

1 answer

473 views

Geometric interpretation of integrals of coordinate rings

asked Jul 4, 2011 at 21:09

8 votes

3 answers

1k views

Is this long sequence of Hom's exact ?

asked Mar 29, 2011 at 17:00

8 votes

4 answers

785 views

Is the Brauer correspondence injective ?

asked Jun 8, 2012 at 9:21

8 votes

5 answers

1k views

Additive integer-valued functions on the module category

asked Jun 19, 2012 at 19:59

8 votes

0 answers

225 views

Depth for non-commutative rings

asked Jan 10, 2013 at 16:19

7 votes

1 answer

745 views

Nilpotency degree of the augmentation ideal

asked Apr 26, 2012 at 19:17

7 votes

4 answers

2k views

Why need the morphisms to form a set ?

asked Dec 9, 2010 at 19:31

6 votes

0 answers

346 views

A question on divisibility of a product of primes

asked Nov 24, 2011 at 16:02

6 votes

0 answers

275 views

Applications of coclass theory

asked May 1, 2012 at 19:54

6 votes

4 answers

1k views

Number of integer combinations $x_1 < \cdots < x_n$?

asked Jan 17, 2012 at 21:04

6 votes

1 answer

276 views

Is there a local-global principle for integral Laurent series ?

asked Nov 14, 2012 at 20:19

5 votes

0 answers

655 views

Do exact functors commute with spectral sequences ?

asked Mar 10, 2013 at 2:36

5 votes

1 answer

624 views

Group actions with finite stabilizers and compact quotients

asked May 27, 2013 at 19:32

5 votes

0 answers

586 views

Inverse limit of graded rings

asked Sep 27, 2012 at 23:48

5 votes

1 answer

326 views

Free left = free right ?

asked Jun 28, 2012 at 23:07

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48 Questions

Verifying the correctness of a Sudoku solution

Is there a Kan-Thurston theorem for fibrations ?

Which spaces are characterized by functions with compact support ?

Axiom of choice and bases of vector spaces over a fixed field

Meaning of 'alternating' group ?

Minimal primes and zero-divisors

Bloch-Kato conjecture and Wiles' numerical criterion

Categories where projective objects are flat

Applications of Govorov-Lazard Theorem?

Classifying spaces of a profinite groups

Is the dual of the product of infinite cyclic groups a free abelian group ?

Fibrations with isomorphic Leray-Serre spectral sequences and non-isomorphic cohomology ?

Classifying space of the unit circle of a valued field

Rings with all modules projective ?

Minimal number of cells of a CW complex (up to homotopy)

Geometric interpretation of integrals of coordinate rings

Is this long sequence of Hom's exact ?

Is the Brauer correspondence injective ?

Additive integer-valued functions on the module category

Depth for non-commutative rings

Nilpotency degree of the augmentation ideal

Why need the morphisms to form a set ?

A question on divisibility of a product of primes

Applications of coclass theory

Number of integer combinations $x_1 < \cdots < x_n$?

Is there a local-global principle for integral Laurent series ?

Do exact functors commute with spectral sequences ?

Group actions with finite stabilizers and compact quotients

Inverse limit of graded rings

Free left = free right ?