User Angelo

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Are extensions of linear algebraic groups (over a field) themselves linear algebraic?

answered Oct 12, 2012 at 15:07

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Carving out subsheaves of local hom-sheaves of stacks of categories

answered May 26, 2012 at 6:39

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Index vs. equivariant index (and then taking invariant part)?

answered Nov 30, 2011 at 7:03

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Does the (torsion) Zariski cohomology of a (singular) hyperplane section of a smooth projective variety vanish (in small degrees)?

answered Dec 2, 2011 at 6:59

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When is restriction an equivalence of categories of equivariant vector bundles?

answered Dec 30, 2011 at 16:50

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Rational functions on reduced complex varieties that extend to global holomorphic functions

answered Jun 14, 2019 at 6:43

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Galois action on special fiber of a stable model

answered Jan 27, 2013 at 14:31

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Generalizing the square theorem

answered Mar 21, 2013 at 6:58

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Are open $\mathbb{G}_m$-invariant subschemes of an affine scheme precisely the homogeneous radical ideals of its coordinate ring?

answered Jan 28, 2020 at 9:08

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A morphism from proper to affine is constant?

answered Aug 7, 2010 at 16:11

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is the preorder of locally closed immersions complete?

answered Apr 15, 2010 at 12:09

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Restriction of divisors to the generic fiber

answered May 8, 2010 at 13:57

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Connection: locally free - locally projective

answered May 22, 2010 at 12:38

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Equivalence between parabolic bundles and bundles on orbicurves

answered Aug 13, 2011 at 7:32

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Linearization of actions of semi-simple groups

answered Aug 29, 2011 at 18:30

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Algebraic stacks as (étale) groupoid algebraic spaces/schemes

answered Aug 30, 2011 at 4:37

1 vote

conormal sequence of quotient of locally complete intersection

answered Jun 15, 2011 at 2:44

1 vote

Finite vector bundles over punctured affine spaces

answered Dec 31, 2010 at 8:57

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An elementary question about the Krull dimension of modules

answered Aug 3, 2010 at 7:35

1 vote

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Log resolutions of linear series

answered Jun 17, 2010 at 18:08

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Is the set of images of an open subset of full-rank matrices an open subset of the Grassmannian?

answered Feb 16, 2020 at 9:56

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Degeneration of vector bundles on an algebraic curve

answered Jun 11, 2021 at 14:06

1 vote

purity for finite flat group schemes

answered Feb 4, 2013 at 16:57

1 vote

The sum of same powers of all matrices modulo p

answered Apr 7, 2013 at 20:11

1 vote

Question about factorization of maps

answered Jul 28, 2012 at 4:31

1 vote

For a hyperplane section Z of X, when there exists its etale X-neighbourhood such that Z is a fibre of its morphism to a curve

answered Sep 22, 2012 at 14:15

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266 Answers

Are extensions of linear algebraic groups (over a field) themselves linear algebraic?

Carving out subsheaves of local hom-sheaves of stacks of categories

Index vs. equivariant index (and then taking invariant part)?

Does the (torsion) Zariski cohomology of a (singular) hyperplane section of a smooth projective variety vanish (in small degrees)?

When is restriction an equivalence of categories of equivariant vector bundles?

Rational functions on reduced complex varieties that extend to global holomorphic functions

Galois action on special fiber of a stable model

Generalizing the square theorem

Are open $\mathbb{G}_m$-invariant subschemes of an affine scheme precisely the homogeneous radical ideals of its coordinate ring?

A morphism from proper to affine is constant?

is the preorder of locally closed immersions complete?

Restriction of divisors to the generic fiber

Connection: locally free - locally projective

Equivalence between parabolic bundles and bundles on orbicurves

Linearization of actions of semi-simple groups

Algebraic stacks as (étale) groupoid algebraic spaces/schemes

conormal sequence of quotient of locally complete intersection

Finite vector bundles over punctured affine spaces

An elementary question about the Krull dimension of modules

Log resolutions of linear series

Is the set of images of an open subset of full-rank matrices an open subset of the Grassmannian?

Degeneration of vector bundles on an algebraic curve

purity for finite flat group schemes

The sum of same powers of all matrices modulo p

Question about factorization of maps

For a hyperplane section Z of X, when there exists its etale X-neighbourhood such that Z is a fibre of its morphism to a curve