83

Answers
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49
How do I check if a functor has a (left/right) adjoint?
37
Order of an automorphism of a finite group
24
How do I know the derived category is NOT abelian?
20
What is the “right” definition of a ring?
17
What is the opposite category of the category of modules (or Hopf algebra representations)?
16
Why do people “forget” Verdier abelianization functor?(Looking for application)
15
Pushouts in the Category of Schemes
14
Nonprojective Surface
13
triangulated vs. dg/A-infinity
9
What is the relationship between t-structure and Torsion pair?
9
Characterization of schemes whose dualizing complex is perfect
8
When does sheaf cohomology commute with arbitrary direct sums?
8
Is the tensorproduct of a triangulated category with a ring again triangulated?
8
Verdier duality via Brown representability?
8
Freyd-Mitchell for triangulated categories?
8
Intuitive Example of a Jacobson Radical
7
Set theory for category theory beginners
7
Why is it a good idea to study a ring by studying its modules?
7
Splitting lemma under assumption of the axiom of choice
7
Matrix factorization categories beyond the isolated singularity case
6
Coreflective Subcategories of the Stable Homotopy Category
6
Assumptions on the category C for sheafification of C-valued presheaves
6
Splitting in triangulated categories
6
Categories which are not compactly generated
6
Can one extend a morphism of commutative triangles to a morphism of octahedral diagrams?
5
Is the chain homotopy category, K(Ab), an Abelian category? By Ab, I mean the category of Abelian groups.
5
Classifying triangulated structures on a graded category
5
distinguished triangles and cohomology
5
When does “splits” imply “cosplits”?
5
Equivalence of derived categories which is not Fourier-Mukai
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