User Hailong Dao

21 votes

6 answers

3k views

A ring such that all projectives are stably free but not all projectives are free?

asked Jun 8, 2010 at 4:08

77 votes

9 answers

25k views

Irreducibility of polynomials in two variables

asked Feb 3, 2010 at 22:49

7 votes

1 answer

251 views

Set of points covered by subspaces of small dimensions

asked Mar 31, 2023 at 22:15

3 votes

2 answers

203 views

Generalizing Pythagorean Theorem: equations defining edges of a (convex) $n$-gon with $n-2$ prescribed angles?

asked Mar 26, 2021 at 19:37

7 votes

1 answer

1k views

How to construct log-canonical (or Calabi-Yau), non-Cohen-Macaulay singularities of low codimensions?

asked Jul 4, 2011 at 2:13

11 votes

2 answers

668 views

Genus of smooth varieties with small Chow group

asked Sep 25, 2011 at 4:27

40 votes

3 answers

2k views

Good user manuals for technical topics?

asked Apr 25, 2010 at 17:53

21 votes

2 answers

1k views

What properties define open loci in excellent schemes?

asked Feb 24, 2010 at 5:03

12 votes

2 answers

631 views

Maps between K-groups induced by rings homomorphism

asked Dec 18, 2009 at 21:22

16 votes

6 answers

2k views

Sum of $n$ vectors in $(\mathbb Z/n)^k$

asked Dec 5, 2009 at 18:14

11 votes

3 answers

1k views

Existence of non-commutative desingularizations

asked Feb 6, 2010 at 2:34

16 votes

2 answers

2k views

Sets that are not sum of subsets

asked Oct 31, 2021 at 3:39

35 votes

3 answers

5k views

Matrix factorizations and physics

asked Dec 25, 2009 at 7:29

8 votes

1 answer

594 views

When is a triangulation of sphere two-colorable?

asked Jun 23, 2021 at 22:46

19 votes

4 answers

856 views

Size of sets with complete double

asked Oct 19, 2019 at 18:03

21 votes

4 answers

2k views

The first female algebraist in US/Britain?

asked Mar 11, 2021 at 1:54

21 votes

1 answer

2k views

Two conjectures by Gabber on Brauer and Picard groups

asked Dec 2, 2009 at 1:24

40 votes

13 answers

19k views

How to draw knots with Latex?

asked Apr 15, 2010 at 6:33

83 votes

4 answers

13k views

How to find ICM talks?

asked Apr 1, 2010 at 13:28

37 votes

2 answers

6k views

What is Serre's condition (S_n) for sheaves?

asked Apr 22, 2010 at 18:03

8 votes

1 answer

274 views

Degrees of syzygies of points in $\mathbb P^2$

asked May 20, 2020 at 14:57

10 votes

1 answer

283 views

Freiman inequality for projective space?

asked Nov 4, 2019 at 18:29

14 votes

1 answer

2k views

Why does this matrix have zero determinant?

asked Oct 27, 2019 at 5:54

9 votes

0 answers

256 views

Is $[JK:(x)][JK:(y,z)]\subseteq JK$ in $k[x,y,z]$?

asked Feb 5, 2019 at 15:45

6 votes

1 answer

159 views

Is $[Im:(x)][Im:(y,z)]\subseteq Im$ in $k[x,y,z]$?

asked Jan 15, 2019 at 16:10

4 votes

0 answers

152 views

Inequalities about tripling and doubling sumsets

asked Dec 8, 2018 at 13:32

5 votes

1 answer

374 views

Criterion for acyclicity of flag complexes

asked Nov 19, 2018 at 1:53

7 votes

1 answer

482 views

Polymath type websites for specialized areas

asked Nov 22, 2018 at 18:28

10 votes

0 answers

338 views

A formula for Frobenius number of certain numerical semigroups

asked Feb 8, 2018 at 19:32

2 votes

1 answer

405 views

Writing integers as determinants of matrices with prime entries.

asked Dec 23, 2017 at 16:23

Stack Exchange Network

62 Questions

A ring such that all projectives are stably free but not all projectives are free?

Irreducibility of polynomials in two variables

Set of points covered by subspaces of small dimensions

Generalizing Pythagorean Theorem: equations defining edges of a (convex) $n$-gon with $n-2$ prescribed angles?

How to construct log-canonical (or Calabi-Yau), non-Cohen-Macaulay singularities of low codimensions?

Genus of smooth varieties with small Chow group

Good user manuals for technical topics?

What properties define open loci in excellent schemes?

Maps between K-groups induced by rings homomorphism

Sum of $n$ vectors in $(\mathbb Z/n)^k$

Existence of non-commutative desingularizations

Sets that are not sum of subsets

Matrix factorizations and physics

When is a triangulation of sphere two-colorable?

Size of sets with complete double

The first female algebraist in US/Britain?

Two conjectures by Gabber on Brauer and Picard groups

How to draw knots with Latex?

How to find ICM talks?

What is Serre's condition (S_n) for sheaves?

Degrees of syzygies of points in $\mathbb P^2$

Freiman inequality for projective space?

Why does this matrix have zero determinant?

Is $[JK:(x)][JK:(y,z)]\subseteq JK$ in $k[x,y,z]$?

Is $[Im:(x)][Im:(y,z)]\subseteq Im$ in $k[x,y,z]$?

Inequalities about tripling and doubling sumsets

Criterion for acyclicity of flag complexes

Polymath type websites for specialized areas

A formula for Frobenius number of certain numerical semigroups

Writing integers as determinants of matrices with prime entries.