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38 votes

Why are flat morphisms "flat?"

answered Nov 25, 2009 at 13:39

19 votes

Accepted

Closed vs Rational Points on Schemes

answered Feb 2, 2010 at 23:03

18 votes

Preschemes and schemes

answered Jan 10, 2010 at 15:44

14 votes

What out-of-print books would you like to see re-printed?

answered Mar 15, 2010 at 18:36

14 votes

Quotient of a Hausdorff topological group by a closed subgroup

answered Dec 15, 2009 at 19:09

12 votes

Learning Class Field Theory: Local or Global First?

answered Nov 27, 2009 at 15:22

10 votes

Accepted

Infinite products of topological groups

answered Feb 13, 2010 at 18:20

7 votes

How should one approach tropical mathematics?

answered Nov 5, 2009 at 10:40

7 votes

Sheaf cohomology and injective resolutions

answered Oct 19, 2009 at 8:44

5 votes

What is a cup-product in group cohomology, and how does it relate to other branches of mathematics?

answered Oct 19, 2009 at 8:50

5 votes

Global fields: What exactly is the analogy between number fields and function fields?

answered Oct 20, 2009 at 6:32

2 votes

Examples and intuition for arithmetic schemes

answered Oct 20, 2009 at 14:21

2 votes

What can't be described by categories?

answered Oct 22, 2009 at 17:37

2 votes

Accepted

Does automatic decomposition of varieties into irreducibles exist?

answered Oct 25, 2009 at 12:11

2 votes

A website linking to most major math journals?

answered Dec 1, 2009 at 23:51

2 votes

Dolbeault cohomology

answered Nov 11, 2009 at 17:38

2 votes

How much of differential geometry can be developed entirely without atlases?

answered Feb 10, 2010 at 18:12

1 vote

Definition of elementary number theory

answered Nov 7, 2009 at 0:11

0 votes

Primary decomposition of zero-dimensional modules

answered Feb 14, 2010 at 19:59

Stack Exchange Network

19 Answers

Why are flat morphisms "flat?"

Closed vs Rational Points on Schemes

Preschemes and schemes

What out-of-print books would you like to see re-printed?

Quotient of a Hausdorff topological group by a closed subgroup

Learning Class Field Theory: Local or Global First?

Infinite products of topological groups

How should one approach tropical mathematics?

Sheaf cohomology and injective resolutions

What is a cup-product in group cohomology, and how does it relate to other branches of mathematics?

Global fields: What exactly is the analogy between number fields and function fields?

Examples and intuition for arithmetic schemes

What can't be described by categories?

Does automatic decomposition of varieties into irreducibles exist?

A website linking to most major math journals?

Dolbeault cohomology

How much of differential geometry can be developed entirely without atlases?

Definition of elementary number theory

Primary decomposition of zero-dimensional modules