User Chen

12 votes

1 answer

668 views

Deformation invariance of Fano varieties

asked Apr 7, 2017 at 12:51

8 votes

1 answer

460 views

Is an open subscheme of a rationally connected variety, rationally connected?

asked Sep 18, 2018 at 11:32

6 votes

1 answer

333 views

Naive question on local cohomology

asked Sep 11, 2018 at 14:40

6 votes

0 answers

169 views

Whitney stratification for proper morphisms

asked Jan 24, 2020 at 14:52

5 votes

0 answers

206 views

Intermediate Jacobian of abelian varieties

asked Dec 20, 2018 at 12:04

5 votes

0 answers

141 views

Poincare duality in families of smooth, projective curves

asked Feb 6, 2019 at 21:07

5 votes

1 answer

1k views

Is projective morphism with projective fiber flat?

asked Sep 5, 2013 at 8:26

5 votes

1 answer

2k views

On Serre's twisting sheaf

asked Sep 5, 2013 at 17:33

4 votes

0 answers

377 views

Fibers of flat morphism

asked Aug 20, 2013 at 19:35

4 votes

1 answer

524 views

Is blowing down functorial?

asked Oct 3, 2013 at 19:55

4 votes

1 answer

1k views

Dimension of the global sections of the Serre twisting sheaf on a curve

asked Nov 7, 2013 at 18:23

4 votes

1 answer

379 views

Examples of smooth projective varieties with "nice" Picard group

asked May 14, 2018 at 15:07

3 votes

1 answer

341 views

Cohomology with compact support

asked Jun 24, 2018 at 10:07

3 votes

0 answers

123 views

Degeneration of cycle class map

asked Feb 11, 2019 at 14:51

3 votes

1 answer

374 views

On equations defining space curves

asked Mar 20, 2015 at 11:54

3 votes

0 answers

233 views

Obstruction to lifting coherent sheaves on discrete valuation ring

asked Sep 1, 2017 at 10:41

3 votes

1 answer

467 views

Why should we study deformations of perfect complexes

asked Sep 12, 2013 at 21:15

3 votes

0 answers

211 views

Relation between Castelnuovo-Mumford regularity for coherent sheaves and modules

asked Sep 17, 2013 at 16:44

3 votes

1 answer

830 views

Is the support of a flat module generically flat?

asked Jan 15, 2019 at 11:32

3 votes

0 answers

134 views

Minimal extension of local systems

asked Jan 20, 2020 at 16:07

3 votes

0 answers

171 views

non-singular divisors of the jacobian variety

asked Mar 2, 2020 at 2:09

3 votes

1 answer

263 views

On tensor product of field extensions

asked Aug 1, 2021 at 23:56

2 votes

0 answers

423 views

Flatness of modules over dual numbers

asked Feb 5, 2019 at 11:39

2 votes

1 answer

212 views

When is the singularity of a semi-normal variety a double point singularity

asked Jan 13, 2022 at 14:15

2 votes

0 answers

264 views

Surjective map from a globally generated vector bundle to its determinant

asked Apr 9, 2022 at 11:06

2 votes

1 answer

339 views

Semi-continuity in quasi-finite morphisms without properness

asked Jul 2, 2022 at 11:17

2 votes

2 answers

998 views

Is the moduli space of stable vector bundles over a smooth projective curve fano?

asked Sep 20, 2013 at 20:43

2 votes

0 answers

477 views

Pullback of global sections of twisted ideal sheaves

asked Sep 20, 2013 at 20:48

2 votes

2 answers

317 views

Projective surfaces with vanishing first cohomology

asked May 14, 2018 at 9:00

2 votes

0 answers

180 views

Linear projection from a point preserves flatness

asked Feb 11, 2019 at 21:44

Stack Exchange Network

50 Questions

Deformation invariance of Fano varieties

Is an open subscheme of a rationally connected variety, rationally connected?

Naive question on local cohomology

Whitney stratification for proper morphisms

Intermediate Jacobian of abelian varieties

Poincare duality in families of smooth, projective curves

Is projective morphism with projective fiber flat?

On Serre's twisting sheaf

Fibers of flat morphism

Is blowing down functorial?

Dimension of the global sections of the Serre twisting sheaf on a curve

Examples of smooth projective varieties with "nice" Picard group

Cohomology with compact support

Degeneration of cycle class map

On equations defining space curves

Obstruction to lifting coherent sheaves on discrete valuation ring

Why should we study deformations of perfect complexes

Relation between Castelnuovo-Mumford regularity for coherent sheaves and modules

Is the support of a flat module generically flat?

Minimal extension of local systems

non-singular divisors of the jacobian variety

On tensor product of field extensions

Flatness of modules over dual numbers

When is the singularity of a semi-normal variety a double point singularity

Surjective map from a globally generated vector bundle to its determinant

Semi-continuity in quasi-finite morphisms without properness

Is the moduli space of stable vector bundles over a smooth projective curve fano?

Pullback of global sections of twisted ideal sheaves

Projective surfaces with vanishing first cohomology

Linear projection from a point preserves flatness