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Greg Stevenson's user avatar
Greg Stevenson's user avatar
Greg Stevenson
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View all questions and answers
answer
81
How do I check if a functor has a (left/right) adjoint?
Nov 17, 2009
answer
50
How do I know the derived category is NOT abelian?
Feb 18, 2010
answer
49
Order of an automorphism of a finite group
Oct 18, 2009
answer
28
What is the "right" definition of a ring?
Oct 27, 2009
answer
27
Pushouts in the Category of Schemes
Nov 12, 2009
answer
25
What is the opposite category of the category of modules (or Hopf algebra representations)?
Jun 25, 2010
answer
22
triangulated vs. dg/A-infinity
Oct 17, 2009
answer
22
Why do people "forget" Verdier abelianization functor?(Looking for application)
Feb 11, 2010
answer
20
Noetherian local ring and the growth of $\dim_k \operatorname{Ext}^i(k,k)$
Oct 31, 2018
answer
19
Nonprojective Surface
Nov 1, 2009