User TJCM

10 votes

4 answers

3k views

Why is an injective quasi-coherent sheaf's restriction to an open subset still an injective object?

ag.algebraic-geometry sheaf-theory

asked Nov 25, 2009 at 4:22

9 votes

2 answers

1k views

Blow up along codimension one closed subscheme

ag.algebraic-geometry

asked Jan 6, 2010 at 20:32

8 votes

2 answers

3k views

Does the fiber product of two normal varieties remain normal?

ag.algebraic-geometry

asked Oct 23, 2009 at 5:43

7 votes

3 answers

3k views

When is a localization of a commutative ring finitely generated as an algebra?

ac.commutative-algebra

asked Nov 22, 2009 at 7:13

7 votes

1 answer

2k views

Completion of modules of differentials (A strange exercise in Liu's AG textbook)

ac.commutative-algebra

asked Nov 24, 2009 at 15:06

7 votes

1 answer

2k views

finite surjective l.c.i morphism is flat

ag.algebraic-geometry

asked Dec 2, 2009 at 5:39

6 votes

1 answer

980 views

The inverse limit of locally free module

ac.commutative-algebra flatness

asked Dec 12, 2009 at 17:20

6 votes

1 answer

260 views

Can the simplicity of abelian varieities be implied by the reduction

abelian-varieties

asked Nov 26, 2010 at 16:50

5 votes

1 answer

3k views

Simply connectedness of algebraic group

algebraic-groups

asked Mar 25, 2010 at 2:22

4 votes

1 answer

598 views

Does the fiber product of two regular varieties over perfect field remain regular?

ag.algebraic-geometry

asked Oct 23, 2009 at 5:46

3 votes

1 answer

2k views

Examples of Equivariant Sheaves under Group action

ag.algebraic-geometry

asked Feb 9, 2010 at 3:01

2 votes

1 answer

681 views

Maximal subfield inside a central division algebra

ra.rings-and-algebras division-algebras

asked Mar 5, 2010 at 22:14

2 votes

2 answers

480 views

tamely branched cover over P^1

ag.algebraic-geometry characteristic-p

asked Dec 26, 2009 at 20:58

2 votes

2 answers

352 views

The algebraicity of Hodge structure map

hodge-theory

asked Mar 16, 2010 at 7:03

2 votes

1 answer

400 views

Is line bundle determined by the parameter space and fiber?

ag.algebraic-geometry

asked Dec 15, 2009 at 2:36

2 votes

1 answer

608 views

Point at infinity on the moduli space of elliptic curves over finite field

ag.algebraic-geometry elliptic-curves

asked Sep 14, 2010 at 1:05

2 votes

0 answers

591 views

Quotient of an algebraic group by the connected component containing identity

algebraic-groups

asked Nov 23, 2010 at 21:19

2 votes

0 answers

980 views

deformation of abelian varieties

abelian-varieties deformation-theory

asked Dec 24, 2010 at 15:36

1 vote

1 answer

719 views

Morphism between polarized abelian varieties

abelian-varieties ag.algebraic-geometry

asked Aug 29, 2010 at 21:32

1 vote

1 answer

998 views

A useful form of principle of connectedness

ag.algebraic-geometry

asked Dec 16, 2009 at 1:46

1 vote

1 answer

417 views

Definition of congruence subgroup for non-matrix groups

algebraic-groups

asked Mar 14, 2010 at 23:49

0 votes

1 answer

588 views

The category of sheaves on a site that is not abelian

ct.category-theory

asked Feb 12, 2010 at 6:05

0 votes

2 answers

187 views

Intrinsic construction of other Galois extensions

nt.number-theory

asked Feb 16, 2010 at 7:11

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23 Questions

Why is an injective quasi-coherent sheaf's restriction to an open subset still an injective object?

Blow up along codimension one closed subscheme

Does the fiber product of two normal varieties remain normal?

When is a localization of a commutative ring finitely generated as an algebra?

Completion of modules of differentials (A strange exercise in Liu's AG textbook)

finite surjective l.c.i morphism is flat

The inverse limit of locally free module

Can the simplicity of abelian varieities be implied by the reduction

Simply connectedness of algebraic group

Does the fiber product of two regular varieties over perfect field remain regular?

Examples of Equivariant Sheaves under Group action

Maximal subfield inside a central division algebra

tamely branched cover over P^1

The algebraicity of Hodge structure map

Is line bundle determined by the parameter space and fiber?

Point at infinity on the moduli space of elliptic curves over finite field

Quotient of an algebraic group by the connected component containing identity

deformation of abelian varieties

Morphism between polarized abelian varieties

A useful form of principle of connectedness

Definition of congruence subgroup for non-matrix groups

The category of sheaves on a site that is not abelian

Intrinsic construction of other Galois extensions