Dan Petersen's user avatar
Dan Petersen's user avatar
Dan Petersen's user avatar
Dan Petersen
  • Member for 14 years, 5 months
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29 votes
2 answers
3k views

What is a self-dual category?

6 votes
0 answers
143 views

Inequality for support of plethysm: "slope" of partitions

16 votes
3 answers
983 views

Reference for representation theory of SL_2(Z/n)

13 votes
2 answers
607 views

Mapping Out(F_n) to the mapping class group

2 votes
1 answer
548 views

Leray spectral sequence for lowest weight part of a smooth morphism

30 votes
0 answers
2k views

What do dessins tell us about the absolute Galois group?

51 votes
5 answers
5k views

What (if anything) unifies stable homotopy theory and Grothendieck's six functors formalism?

7 votes
1 answer
454 views

$\infty$-local systems

15 votes
1 answer
521 views

Defining Massey products as transgressions

5 votes
1 answer
403 views

Shrinking and stretching of vector bundles

15 votes
2 answers
938 views

Mixed Hodge structure on configuration spaces

11 votes
1 answer
507 views

On the coalgebraic homotopy transfer theorem

19 votes
3 answers
2k views

What's the status of Arthur's announced classification for GSp(4)?

14 votes
2 answers
665 views

Koszulness of the cohomology ring of moduli of stable genus zero curves

17 votes
1 answer
516 views

Splitting the injection that you get from the Poincaré-Birkhoff-Witt theorem

7 votes
0 answers
206 views

IH-moves on trivalent graphs, and a complex that might be known to low-dimensional topologists

10 votes
0 answers
239 views

Has anyone seen this construction of dg algebras?

10 votes
1 answer
621 views

Tensor products of $\infty$-algebras over operads

15 votes
0 answers
520 views

Is this an $E_\infty$-algebra?

13 votes
0 answers
530 views

Cohomology of a blow-up of a real algebraic variety

11 votes
1 answer
756 views

A frustrating cohomology class on the moduli of abelian surfaces

9 votes
0 answers
242 views

Homology of an interesting Lie algebra

24 votes
2 answers
1k views

Peter-Weyl vs. Schur-Weyl theorem

35 votes
1 answer
4k views

Grothendieck's letter to Faltings: On the yoga of motives and the degeneration of Leray spectral sequence

9 votes
1 answer
364 views

Does this notion related to species/operads/FI-modules have a name?

9 votes
0 answers
437 views

What's the analogue of a Young symmetrizer in the Brauer algebra?

13 votes
1 answer
464 views

A cdga for compactly supported cohomology (à la Sullivan's algebra of polynomial forms)

21 votes
1 answer
4k views

What makes the Cartier operator "tick"?

14 votes
0 answers
285 views

What's the dimension of the space of CM cusp forms?

26 votes
3 answers
2k views

Which mapping class group representations come from algebraic geometry?