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Leonid Positselski's user avatar
Leonid Positselski's user avatar
Leonid Positselski's user avatar
Leonid Positselski
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129 Answers

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8 votes
Accepted

Compatibility of two definitions of Koszul dual

8 votes
Accepted

When are projective modules closed under highly-filtered colimits?

7 votes
Accepted

Semisimple Abelian categories with infinite sums

7 votes

Derived Hom without injectives nor projectives

7 votes
Accepted

Dual of a projective module

7 votes
Accepted

Gluing perverse sheaves?

7 votes

An example of a Z-PBW algebra which is not a PBW algebra?

7 votes

What is the (Koszul? derived?) interpretation of a pair of Lie algebras with the same cohomology?

7 votes
Accepted

Hochschild homology of dga's

7 votes

How is this observation related to Koszul duality?

6 votes
Accepted

Indexing the Line Bundles of a Flag Manifold

6 votes
Accepted

A result on prime numbers

6 votes

Indexing the line bundles over a Grassmannian.

6 votes

Is every dg-coalgebra the colimit of its finite dimensional dg-subcoalgebras?

6 votes

Tensor product of coaugmented conilpotent coalgebras

6 votes
Accepted

Exact sequences in Positselski's coderived category induce distinguished triangles

6 votes
Accepted

On definitions and explicit examples of pure-injective modules

6 votes
Accepted

Graded quivers vs "ordinary" quivers and derived categories

6 votes
Accepted

Resolutions by free Differential Graded Algebras

6 votes
Accepted

When an exact embedding of abelian categories induces a full embedding of their derived categories?

5 votes
Accepted

projective generator in the category of left-exact functors

5 votes
Accepted

DG-projective vs. K-projective complexes

5 votes
Accepted

Example of a projective module with non-superfluous radical

5 votes

A technical question about derivations of sheaves on group schemes

5 votes

Cohomology of Flag Varieties

5 votes

What is a Module over a Lie algebroid?

5 votes

Sequential colim vs sequential hocolim

5 votes

A question on curved algebras, papers by Positselski and E. Segal

4 votes

How to become a good mathematician?

4 votes
Accepted

What's "projective" about "projective pro-finite groups"?