User Greg Stevenson

8 votes

Equivalence of derived categories which is not Fourier-Mukai

answered Oct 27, 2009 at 20:25

8 votes

What are the most important instances of the "yoga of generic points"?

answered Oct 23, 2009 at 23:01

8 votes

Accepted

Graded local rings versus local rings

answered Oct 19, 2009 at 5:25

8 votes

What is interesting/useful about big Witt Vectors?

answered Oct 17, 2009 at 8:47

7 votes

Stalks of sheaf-hom

answered Oct 15, 2009 at 21:49

7 votes

"Points" in algebraic geometry: Why shift from m-Spec to Spec?

answered Oct 16, 2009 at 11:01

7 votes

When does the sheaf direct image functor f_* have a right adjoint?

answered Oct 27, 2009 at 20:05

7 votes

Set theory for category theory beginners

answered Nov 22, 2009 at 3:27

7 votes

Are quotients of polynomial rings almost UFDs?

answered Nov 15, 2009 at 0:24

7 votes

Accepted

Splitting lemma under assumption of the axiom of choice

answered Nov 15, 2009 at 22:33

7 votes

Accepted

locally finitely presentable tensor categories

answered May 30, 2017 at 15:32

6 votes

Is the homotopy category of a ring also the derived category of another ring?

answered Jul 6, 2014 at 18:19

6 votes

Accepted

Coreflective Subcategories of the Stable Homotopy Category

answered Feb 16, 2012 at 7:07

6 votes

Do the signs in Puppe sequences matter?

answered Nov 18, 2009 at 11:44

6 votes

Localization(s) of Categories

answered Oct 27, 2009 at 23:45

6 votes

Accepted

When are GIT quotients projective?

answered Nov 21, 2009 at 0:31

6 votes

Accepted

Does the fiber product of two regular varieties over perfect field remain regular?

answered Oct 23, 2009 at 6:06

5 votes

Different definitions of the dimension of an algebra

answered Oct 26, 2009 at 1:36

5 votes

How to think about model categories?

answered Oct 23, 2009 at 22:44

5 votes

When does "splits" imply "cosplits"?

answered Nov 2, 2009 at 8:35

5 votes

Accepted

How is this action of monoidal derived category induced?

answered Feb 9, 2010 at 6:37

5 votes

Assumptions on the category C for sheafification of C-valued presheaves

answered Nov 7, 2009 at 1:11

5 votes

Accepted

When do chain complexes decompose as a direct sum?

answered Jul 22, 2010 at 0:04

5 votes

Accepted

Classification of t-structures in derived category of R-mod?

answered Jul 15, 2010 at 21:02

4 votes

Primary decomposition for modules

answered Nov 3, 2009 at 7:44

4 votes

Global proof of Serre duality

answered Nov 19, 2009 at 21:42

4 votes

Accepted

Sources for exact triangles in triangulated categories.

answered Nov 14, 2009 at 3:07

4 votes

Accepted

Tate Cohomology via stable categories

answered Jan 25, 2010 at 11:18

4 votes

Accepted

Algebraic Geometry in an applied setting?

answered Oct 25, 2009 at 20:35

4 votes

Exactness of filtered colimits

answered Oct 23, 2009 at 22:29

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86 Answers

Equivalence of derived categories which is not Fourier-Mukai

What are the most important instances of the "yoga of generic points"?

Graded local rings versus local rings

What is interesting/useful about big Witt Vectors?

Stalks of sheaf-hom

"Points" in algebraic geometry: Why shift from m-Spec to Spec?

When does the sheaf direct image functor f_* have a right adjoint?

Set theory for category theory beginners

Are quotients of polynomial rings almost UFDs?

Splitting lemma under assumption of the axiom of choice

locally finitely presentable tensor categories

Is the homotopy category of a ring also the derived category of another ring?

Coreflective Subcategories of the Stable Homotopy Category

Do the signs in Puppe sequences matter?

Localization(s) of Categories

When are GIT quotients projective?

Does the fiber product of two regular varieties over perfect field remain regular?

Different definitions of the dimension of an algebra

How to think about model categories?

When does "splits" imply "cosplits"?

How is this action of monoidal derived category induced?

Assumptions on the category C for sheafification of C-valued presheaves

When do chain complexes decompose as a direct sum?

Classification of t-structures in derived category of R-mod?

Primary decomposition for modules

Global proof of Serre duality

Sources for exact triangles in triangulated categories.

Tate Cohomology via stable categories

Algebraic Geometry in an applied setting?

Exactness of filtered colimits