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Answer a question with score of 1 or more.

Awarded 15814 times.

are deformations of torsion modules always torsion?

Awarded Oct 11, 2009 at 17:51

Ian Shipman

1,0386 silver badges14 bronze badges

Can one check formal smoothness using only one-variable Artin rings?

Awarded Oct 10, 2009 at 4:52

S. Carnahan♦

45.7k6 gold badges114 silver badges220 bronze badges

What's the sense in which A_\infty algebras are "deformable"?

Awarded Oct 9, 2009 at 18:52

James Griffin

5042 silver badges7 bronze badges

How to topologize X(R) when R is a topological ring?

Awarded Oct 9, 2009 at 6:51

Rebecca Bellovin

1,9881 gold badge15 silver badges20 bronze badges

Is there a good computer package for working with complexes over non-commutative rings?

Awarded Oct 9, 2009 at 6:36

Mikael Vejdemo-Johansson

2,5371 gold badge20 silver badges30 bronze badges

How do you show that $S^{\infty}$ is contractible?

Awarded Oct 9, 2009 at 1:37

Dror Bar-Natan

1512 bronze badges

Ribbon graph decomposition of the moduli space of curves

Awarded Oct 8, 2009 at 11:57

Theo Johnson-Freyd

54.6k10 gold badges142 silver badges335 bronze badges

What is a topos?

Awarded Oct 7, 2009 at 12:36

Kevin H. Lin

21k10 gold badges116 silver badges190 bronze badges

Is there a category in which finite limits and directed colimits *don't* commute

Awarded Oct 7, 2009 at 0:53

Eric Wofsey

31.2k2 gold badges115 silver badges151 bronze badges

How can you tell if a space is homotopy equivalent to a manifold?

Awarded Oct 6, 2009 at 23:28

Martin O

6216 silver badges3 bronze badges

What is interesting/useful about Castelnuovo-Mumford regularity?

Awarded Oct 6, 2009 at 2:11

Daniel Erman

2,9552 gold badges26 silver badges24 bronze badges

What is the exact statement of "there are 27 lines on a cubic"?

Awarded Oct 5, 2009 at 19:20

John McCleary

611 bronze badge

How to understand character sheaves

Awarded Oct 5, 2009 at 3:00

Ben Webster♦

44.7k12 gold badges126 silver badges260 bronze badges

What is interesting/useful about Castelnuovo-Mumford regularity?

Awarded Oct 4, 2009 at 23:05

Ilya Nikokoshev

15.1k12 gold badges77 silver badges129 bronze badges

Is there a universal property for Witt vectors?

Awarded Oct 4, 2009 at 23:05

Morten Brun

1012 bronze badges

(post deleted or otherwise unavailable)

Awarded Oct 4, 2009 at 17:55

streklin

6906 silver badges11 bronze badges

How to approximate a solution to a matrix equation?

Awarded Oct 3, 2009 at 19:00

Anon

211 bronze badge

Complete theory with exactly n countable models?

Awarded Oct 3, 2009 at 1:25

reb

1452 bronze badges

Which are the best mathematics journals, and what are the differences between them?

Awarded Oct 2, 2009 at 14:55

Andrew Stacey

26.8k12 gold badges113 silver badges187 bronze badges

Supersingular elliptic curves

Awarded Oct 2, 2009 at 14:50

David Zureick-Brown

10.5k3 gold badges39 silver badges96 bronze badges

LaTeX based document editors

Awarded Oct 2, 2009 at 13:35

las3rjock

2063 silver badges8 bronze badges

Is a quotient of a reductive group reductive?

Awarded Oct 2, 2009 at 4:15

Jarod Alper

7165 silver badges5 bronze badges

Is there an example of an algebraic stack whose closed points have affine stabilizers but whose diagonal is not affine?

Awarded Oct 2, 2009 at 3:30

David Rydh

5,03937 silver badges35 bronze badges

What is the universal property of normalization?

Awarded Oct 1, 2009 at 16:55

Charley

9167 silver badges6 bronze badges

Homomorphism more than 3/4 the inverse

Awarded Oct 1, 2009 at 14:20

solbap

3,9681 gold badge28 silver badges41 bronze badges

Can a vector space over an infinite field be a finite union of proper subspaces?

Awarded Oct 1, 2009 at 4:10

Jonathan Wise

7,9941 gold badge47 silver badges53 bronze badges

If $\Omega_{X/Y}$ is locally free of rank $\mathrm{dim}\left(X\right)-\mathrm{dim}\left(Y\right)$, is $X\rightarrow Y$ smooth?

Awarded Oct 1, 2009 at 3:15

Ishaidc

3131 silver badge4 bronze badges

Can a vector space over an infinite field be a finite union of proper subspaces?

Awarded Sep 30, 2009 at 15:17

Richard Dore

5,2756 gold badges36 silver badges43 bronze badges

Finite extension of fields with no primitive element

Awarded Sep 30, 2009 at 15:17

Alon Amit

6,7343 gold badges53 silver badges83 bronze badges

LaTeX based document editors

Awarded Sep 30, 2009 at 15:17

Noah Snyder

28.1k4 gold badges94 silver badges170 bronze badges

(post deleted or otherwise unavailable)

Awarded Sep 30, 2009 at 15:17

Alberto Zaccagni

2583 silver badges8 bronze badges

LaTeX based document editors

Awarded Sep 30, 2009 at 15:17

Andrew Walker

1314 bronze badges

Learning about Lie groups

Awarded Sep 30, 2009 at 15:17

Kim Morrison

7,8007 gold badges48 silver badges75 bronze badges

Is a quotient of a reductive group reductive?

Awarded Sep 30, 2009 at 15:17

Anton Geraschenko

24k17 gold badges127 silver badges180 bronze badges

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