User Georges Elencwajg

14 votes

Why and how did preschemes become schemes?

answered Feb 16, 2011 at 19:28

14 votes

Chern classes of a blow-up at a point

answered Mar 30, 2012 at 9:55

14 votes

Accepted

Recommended books/lecture notes for vector bundle on algebraic curve

answered Jun 6, 2013 at 9:28

14 votes

Accepted

Henselization of a local ring

answered Apr 26, 2012 at 21:21

14 votes

A GAGA question

answered Dec 30, 2009 at 9:20

14 votes

Fundamental Examples

answered Nov 11, 2009 at 8:45

14 votes

Accepted

A mathematical idea "abstract enough to be useless for physics"

answered Sep 7, 2010 at 7:35

14 votes

Total space of the line bundle $\mathcal{O}(1)$ over $\mathbb{P}^n$

answered Nov 7, 2010 at 2:30

14 votes

Accepted

Presheaves are locally sheaves?

answered Jan 11, 2011 at 8:48

13 votes

Accepted

Reference for tensor products of fields

answered Dec 10, 2010 at 14:03

13 votes

Motivating the de Rham theorem

answered Oct 26, 2010 at 20:02

13 votes

Justification of the term "invertible sheaf"

answered Jul 27, 2010 at 13:46

13 votes

Extra principal Cartier divisors on non-Noetherian rings? (answered: no!)

answered Jun 17, 2010 at 20:38

13 votes

What should be learned in a first serious schemes course?

answered Jun 18, 2010 at 11:39

13 votes

Is there an existing name for "piecewise vector multiplication"

answered Dec 17, 2009 at 14:14

13 votes

Name and/or uses for the spectrum of a stalk?

answered Jul 25, 2013 at 17:54

13 votes

Accepted

Examples of Noetherian overkill

answered Nov 22, 2015 at 21:25

13 votes

Affine bundles over varieties

answered Feb 6, 2011 at 16:17

12 votes

Accepted

Urge/reason for inventing interior product ( Grassmann algebra )

answered Jul 23, 2012 at 20:30

12 votes

Accepted

Most important domains, extension theorems, and functions in several complex variables

answered Dec 14, 2009 at 10:16

12 votes

Are quotients of polynomial rings almost UFDs?

answered Nov 15, 2009 at 0:35

12 votes

Finite covers of complex varieties (all but two questions answered!)

answered Oct 1, 2010 at 22:39

12 votes

Non finitely-generated subalgebra of a finitely-generated algebra

answered Dec 9, 2010 at 20:49

11 votes

Irreducibility of Analytic Sets

answered Jan 1, 2011 at 20:37

11 votes

Accepted

Are spaces of holomorphic maps manifolds?

answered May 31, 2010 at 13:55

11 votes

Geometry meaning of higher cohomology of sheaves?

answered Jan 10, 2010 at 15:29

11 votes

Regular spaces that are not completely regular

answered Mar 7, 2010 at 14:17

11 votes

Nonfree projective module over a regular UFD?

answered Feb 5, 2011 at 10:50

11 votes

What holomorphic functions are limits of polynomials?

answered Mar 25, 2011 at 9:57

11 votes

Accepted

Explicit way to construct simple complex tori/abelian varieties of dimension at least 2

answered Dec 18, 2011 at 10:38

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239 Answers

Why and how did preschemes become schemes?

Chern classes of a blow-up at a point

Recommended books/lecture notes for vector bundle on algebraic curve

Henselization of a local ring

A GAGA question

Fundamental Examples

A mathematical idea "abstract enough to be useless for physics"

Total space of the line bundle $\mathcal{O}(1)$ over $\mathbb{P}^n$

Presheaves are locally sheaves?

Reference for tensor products of fields

Motivating the de Rham theorem

Justification of the term "invertible sheaf"

Extra principal Cartier divisors on non-Noetherian rings? (answered: no!)

What should be learned in a first serious schemes course?

Is there an existing name for "piecewise vector multiplication"

Name and/or uses for the spectrum of a stalk?

Examples of Noetherian overkill

Affine bundles over varieties

Urge/reason for inventing interior product ( Grassmann algebra )

Most important domains, extension theorems, and functions in several complex variables

Are quotients of polynomial rings almost UFDs?

Finite covers of complex varieties (all but two questions answered!)

Non finitely-generated subalgebra of a finitely-generated algebra

Irreducibility of Analytic Sets

Are spaces of holomorphic maps manifolds?

Geometry meaning of higher cohomology of sheaves?

Regular spaces that are not completely regular

Nonfree projective module over a regular UFD?

What holomorphic functions are limits of polynomials?

Explicit way to construct simple complex tori/abelian varieties of dimension at least 2