User Hailong Dao

6 votes

Example of a variety with $K_X$ $\mathbb Q$-Cartier but not Cartier

answered Feb 15, 2011 at 16:51

6 votes

Accepted

Top degree local cohomology under action by a non-zerodivisor

answered Apr 4, 2011 at 4:44

6 votes

Unsolved problems concerning Artinian Rings and Artinian Modules

answered Apr 9, 2011 at 5:24

6 votes

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CM for primary ideal

answered Mar 24, 2011 at 16:03

6 votes

Accepted

Reference request, direct summand conjecture in dimension 2

answered Oct 5, 2010 at 17:37

6 votes

Length of I/I^2 versus Ann(I)/Ann(I)^2 in Artinian rings.

answered Oct 8, 2010 at 17:35

6 votes

Does regularity of a prime ideal in the fibre imply regularity of the prime?

answered Oct 16, 2010 at 2:45

6 votes

Determining if a ring satisfies Serre's condition S_{n}

answered Aug 28, 2010 at 8:19

6 votes

Restriction of Ext sheaves

answered Sep 6, 2010 at 15:39

6 votes

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Vanishing of Self-Ext groups of vector bundles

answered Aug 13, 2010 at 15:02

6 votes

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Irreducible components of quotients of Cohen-Macaulay rings of the "correct" dimension

answered Aug 1, 2010 at 4:37

6 votes

Context for intersection theory

answered Apr 17, 2010 at 20:55

6 votes

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What is the most simple non-planar Gorenstein curve singularity?

answered May 30, 2010 at 4:59

6 votes

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Are any finitely generated reflexive module a 2nd syzygy?

answered Dec 2, 2009 at 16:46

6 votes

Generalizing miracle flatness (Matsumura 23.1) via finite Tor-dimension

answered Dec 1, 2009 at 18:43

6 votes

Examples of finite local rings of length 2 or 3

answered Dec 5, 2009 at 6:45

6 votes

Complete discrete valuation rings with residue field ℤ/p

answered Dec 26, 2009 at 6:15

6 votes

Two-dimensional quotient singularities are rational: why?

answered Dec 16, 2009 at 4:58

6 votes

MaxSpec, Spec, ... "RadSpec"? Or, why not look at all radical ideals?

answered Feb 5, 2010 at 21:46

6 votes

Accepted

In what degrees does Ext(S/(f),S) vanish?

answered Feb 11, 2010 at 15:45

6 votes

Which rings are subrings of matrix rings?

answered Nov 28, 2009 at 19:16

6 votes

algorithm for calculating the Chow groups of a variety over a finite field

answered Jan 10, 2010 at 17:03

6 votes

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A proper definition of connectivity for hypergraphs

answered Feb 9, 2019 at 21:25

6 votes

When are MCM ideals principal?

answered May 15, 2020 at 18:28

6 votes

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A name for "not quite saturated" graded modules

answered Jul 19, 2011 at 5:10

6 votes

Accepted

Frobenius functor and length of local cohomology

answered Nov 29, 2011 at 2:16

6 votes

Recent, elementary results in algebraic geometry

answered Nov 3, 2014 at 21:51

6 votes

Criterion for being reflexive via Ext

answered Jul 21, 2016 at 15:50

6 votes

When is the module of Kahler volume forms torsion-free?

answered Apr 16, 2013 at 20:14

5 votes

Accepted

Do taking a general hyperplane section and taking a colon ideal commute?

answered Sep 25, 2013 at 0:40

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269 Answers

Example of a variety with $K_X$ $\mathbb Q$-Cartier but not Cartier

Top degree local cohomology under action by a non-zerodivisor

Unsolved problems concerning Artinian Rings and Artinian Modules

CM for primary ideal

Reference request, direct summand conjecture in dimension 2

Length of I/I^2 versus Ann(I)/Ann(I)^2 in Artinian rings.

Does regularity of a prime ideal in the fibre imply regularity of the prime?

Determining if a ring satisfies Serre's condition S_{n}

Restriction of Ext sheaves

Vanishing of Self-Ext groups of vector bundles

Irreducible components of quotients of Cohen-Macaulay rings of the "correct" dimension

Context for intersection theory

What is the most simple non-planar Gorenstein curve singularity?

Are any finitely generated reflexive module a 2nd syzygy?

Generalizing miracle flatness (Matsumura 23.1) via finite Tor-dimension

Examples of finite local rings of length 2 or 3

Complete discrete valuation rings with residue field ℤ/p

Two-dimensional quotient singularities are rational: why?

MaxSpec, Spec, ... "RadSpec"? Or, why not look at all radical ideals?

In what degrees does Ext(S/(f),S) vanish?

Which rings are subrings of matrix rings?

algorithm for calculating the Chow groups of a variety over a finite field

A proper definition of connectivity for hypergraphs

When are MCM ideals principal?

A name for "not quite saturated" graded modules

Frobenius functor and length of local cohomology

Recent, elementary results in algebraic geometry

Criterion for being reflexive via Ext

When is the module of Kahler volume forms torsion-free?

Do taking a general hyperplane section and taking a colon ideal commute?