User Leonid Positselski

82 votes

How Much Work Does it Take to be a Successful Mathematician?

answered Dec 26, 2009 at 19:54

65 votes

What is Koszul duality?

answered Nov 27, 2009 at 13:01

63 votes

Accepted

Is "semisimple" a dense condition among Lie algebras?

answered Dec 24, 2009 at 9:36

60 votes

Accepted

Why does the Gamma-function complete the Riemann Zeta function?

answered Dec 3, 2009 at 13:09

41 votes

Name for abelian category in which every short exact sequence splits

answered Apr 13, 2019 at 0:28

40 votes

Accepted

Are the inner automorphisms the only ones that extend to every overgroup?

answered Dec 4, 2009 at 17:59

34 votes

Accepted

Does the derived category remember the homological dimension?

answered Mar 5, 2011 at 10:28

29 votes

Non-commutative algebraic geometry

answered Dec 5, 2009 at 23:42

28 votes

Accepted

Is there an additive functor between abelian categories which isn't exact in the middle?

answered Nov 14, 2010 at 11:53

28 votes

Accepted

Geometric interpretation of filtered rings and modules

answered May 25, 2010 at 14:39

26 votes

"Pick up a homological algebra book and prove all of the theorems yourself" (exercise from Lang's Algebra)

answered Jan 6, 2010 at 12:28

24 votes

Can skeleta simplify category theory?

answered Jan 13, 2010 at 18:58

24 votes

Accepted

Profinite groups as absolute Galois groups

answered Mar 6, 2016 at 21:54

24 votes

Accepted

Is the category of left exact functors abelian?

answered Apr 29, 2018 at 17:59

22 votes

Accepted

On limits and Colimits

answered Dec 12, 2009 at 13:09

21 votes

The composition of derived functors - commutation fails hazardly?

answered Dec 20, 2011 at 21:36

19 votes

Accepted

Existence of projective resolutions in abelian categories

answered Dec 7, 2009 at 23:19

17 votes

Comodule exercises desired

answered Jul 28, 2010 at 21:12

17 votes

Accepted

When is bar-cobar duality an equivalence?

answered Jun 6, 2016 at 18:50

16 votes

Accepted

Splitting of exact triangles in derived category

answered Dec 23, 2017 at 21:44

16 votes

What are examples of cogenerators in R-mod?

answered Sep 8, 2010 at 22:03

16 votes

Accepted

$\mathcal{D}$-quasi-isomorphisms and coherent $\Omega$-modules

answered Apr 30, 2012 at 19:52

15 votes

Accepted

Tensored Over Abelian Groups?

answered Dec 9, 2009 at 14:02

15 votes

Accepted

Algebraic geometry for cocommutative corings with counit.

answered Dec 16, 2009 at 19:18

14 votes

Does homology detect chain homotopy equivalence?

answered Jan 6, 2010 at 23:50

14 votes

Accepted

Is there an adjoint to the inclusion of I-adically complete modules to all modules?

answered Nov 25, 2018 at 23:59

14 votes

Accepted

Upgrade adjunction to equivalence

answered Dec 1, 2018 at 18:54

13 votes

Upgrade adjunction to equivalence

answered Dec 1, 2018 at 22:51

13 votes

Accepted

Is every balanced pre-abelian category abelian?

answered Oct 11, 2010 at 0:11

13 votes

Accepted

koszul duality and algebras over operads

answered Sep 22, 2010 at 11:43

Stack Exchange Network

129 Answers

How Much Work Does it Take to be a Successful Mathematician?

What is Koszul duality?

Is "semisimple" a dense condition among Lie algebras?

Why does the Gamma-function complete the Riemann Zeta function?

Name for abelian category in which every short exact sequence splits

Are the inner automorphisms the only ones that extend to every overgroup?

Does the derived category remember the homological dimension?

Non-commutative algebraic geometry

Is there an additive functor between abelian categories which isn't exact in the middle?

Geometric interpretation of filtered rings and modules

"Pick up a homological algebra book and prove all of the theorems yourself" (exercise from Lang's Algebra)

Can skeleta simplify category theory?

Profinite groups as absolute Galois groups

Is the category of left exact functors abelian?

On limits and Colimits

The composition of derived functors - commutation fails hazardly?

Existence of projective resolutions in abelian categories

Comodule exercises desired

When is bar-cobar duality an equivalence?

Splitting of exact triangles in derived category

What are examples of cogenerators in R-mod?

$\mathcal{D}$-quasi-isomorphisms and coherent $\Omega$-modules

Tensored Over Abelian Groups?

Algebraic geometry for cocommutative corings with counit.

Does homology detect chain homotopy equivalence?

Is there an adjoint to the inclusion of I-adically complete modules to all modules?

Upgrade adjunction to equivalence

Upgrade adjunction to equivalence

Is every balanced pre-abelian category abelian?

koszul duality and algebras over operads