User Angelo

18 votes

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Is the complement of an affine variety always a divisor?

answered Apr 21, 2010 at 12:41

18 votes

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Analytic vs. formal vs. étale singularities

answered Jan 9, 2011 at 17:15

17 votes

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non-locally trivial A^n bundles

answered Mar 10, 2011 at 7:02

17 votes

To what extent is it true that "number theory = mathematics"?

answered May 29, 2010 at 15:20

17 votes

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Smooth variety contained in another smooth variety

answered Feb 23, 2012 at 4:00

17 votes

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Is $H^i(X,F)$ finitely generated over $\Gamma(O_X)$ if $F$ is coherent?

answered Feb 25, 2012 at 12:49

17 votes

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Factoriality: local or global?

answered Mar 14, 2013 at 13:05

16 votes

Duals of Abelian Categories

answered Sep 23, 2010 at 9:29

15 votes

What is the center of Qcoh(X)?

answered Oct 11, 2010 at 15:28

15 votes

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Is the functor of open subschemes representable?

answered Apr 9, 2010 at 21:03

15 votes

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flatness of power series rings

answered Jan 31, 2013 at 13:11

14 votes

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The composition of derived functors - commutation fails hazardly?

answered Dec 20, 2011 at 15:08

14 votes

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non-isomorphic stably isomorphic fields

answered May 12, 2012 at 16:02

14 votes

What is the minimal number of symmetric generators of the full matrix algebra?

answered Sep 1, 2012 at 9:15

14 votes

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Non-dominant polynomial maps in the plane

answered Oct 27, 2010 at 8:54

14 votes

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Pushing Complex Structure Forward

answered Jan 7, 2011 at 20:03

14 votes

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Cancellation problem for curves

answered Nov 24, 2010 at 22:27

14 votes

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Diagonalizable subgroups of a connected linear algebraic group

answered Apr 6, 2011 at 9:53

14 votes

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Does the action of an affine group scheme preserve the nilradical of an algebra?

answered Jun 21, 2011 at 12:59

13 votes

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Irreducible component of a Cohen-Macaulay variety

answered Jun 14, 2011 at 4:54

13 votes

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Is there a 'best' name for a group together with a set it acts on?

answered May 12, 2011 at 16:47

13 votes

Consequences of not requiring ring homomorphisms to be unital?

answered Aug 3, 2010 at 6:48

13 votes

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Degree of canonical bundle?

answered Sep 6, 2010 at 13:12

13 votes

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Cohomologically trivial stacks

answered Nov 20, 2012 at 7:15

13 votes

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commuting elements in a reductive group

answered May 25, 2012 at 0:15

12 votes

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Examples of injective morphisms which are not universally injective

answered Nov 25, 2012 at 10:02

12 votes

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Resolution of singularities for flat families.

answered Feb 9, 2012 at 16:13

12 votes

A simple question about the degree of some vector bundle over rational curve.

answered Jan 26, 2012 at 5:14

12 votes

Rigid monoidal abelian category without an exact tensor functor to Vect

answered Feb 22, 2013 at 4:59

12 votes

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Rigidification and good moduli space (morphism) in the sense of Alper

answered May 15, 2013 at 18:18

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266 Answers

Is the complement of an affine variety always a divisor?

Analytic vs. formal vs. étale singularities

non-locally trivial A^n bundles

To what extent is it true that "number theory = mathematics"?

Smooth variety contained in another smooth variety

Is $H^i(X,F)$ finitely generated over $\Gamma(O_X)$ if $F$ is coherent?

Factoriality: local or global?

Duals of Abelian Categories

What is the center of Qcoh(X)?

Is the functor of open subschemes representable?

flatness of power series rings

The composition of derived functors - commutation fails hazardly?

non-isomorphic stably isomorphic fields

What is the minimal number of symmetric generators of the full matrix algebra?

Non-dominant polynomial maps in the plane

Pushing Complex Structure Forward

Cancellation problem for curves

Diagonalizable subgroups of a connected linear algebraic group

Does the action of an affine group scheme preserve the nilradical of an algebra?

Irreducible component of a Cohen-Macaulay variety

Is there a 'best' name for a group together with a set it acts on?

Consequences of not requiring ring homomorphisms to be unital?

Degree of canonical bundle?

Cohomologically trivial stacks

commuting elements in a reductive group

Examples of injective morphisms which are not universally injective

Resolution of singularities for flat families.

A simple question about the degree of some vector bundle over rational curve.

Rigid monoidal abelian category without an exact tensor functor to Vect

Rigidification and good moduli space (morphism) in the sense of Alper