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shenghao
  • Member for 13 years, 1 month
  • Last seen more than 3 years ago
  • Beijing
24 votes
4 answers
3k views

What are the automorphism groups of (principally polarized) abelian varieties?

22 votes
3 answers
5k views

The algebraic fundamental group of a reductive algebraic group

17 votes
2 answers
3k views

comparison of de Rham cohomology and etale cohomology

15 votes
0 answers
718 views

Lifting varieties from char. $p$ to char. 0 after alterations

12 votes
1 answer
1k views

Hodge structures on algebraic spaces

11 votes
4 answers
2k views

Picard group of reducible varieties

11 votes
1 answer
1k views

blow-up proper varieties to projective ones

10 votes
3 answers
2k views

Analytic continuation of holomorphic functions

10 votes
1 answer
1k views

A faithful representation "generates" all the other representations

10 votes
1 answer
500 views

"geometric" interpretation of the alternating sum of intersection cohomology groups

10 votes
1 answer
608 views

Is there an explicit example of a coefficient sheaf for which hard Lefschetz fails?

9 votes
4 answers
1k views

cohomology of moduli spaces

9 votes
1 answer
1k views

coarse moduli space of DM stacks

8 votes
1 answer
767 views

References on Moishezon spaces in English/French

8 votes
3 answers
3k views

The automorphism group of a hyperelliptic curve

7 votes
0 answers
532 views

intersection theory on proper algebraic spaces

7 votes
0 answers
870 views

Poincaré duality for intersection cohomology

7 votes
3 answers
2k views

Tensor product of simple representations

7 votes
3 answers
2k views

Is the inertia stack of a Deligne-Mumford stack always finite?

7 votes
1 answer
714 views

affine morphism

7 votes
0 answers
716 views

What is the decomposition group at $p$ in the Galois group unramified outside $\ell?$

7 votes
1 answer
568 views

Does intersection pairing on `$IH^*(X)$` agree with cup-product on `$H^*(X)$`?

6 votes
1 answer
2k views

References on semismall maps

6 votes
2 answers
593 views

Is the weight filtration a topological invariant?

6 votes
2 answers
1k views

Does S^6 have the structure of an algebraic variety?

6 votes
2 answers
1k views

Does every regular Noetherian domain have finite Krull dimension?

6 votes
1 answer
1k views

monodromy and global cohomology

5 votes
1 answer
3k views

Is there a general projection formula for morphisms of ringed topoi?

5 votes
0 answers
694 views

finite etale covering of stacks

5 votes
1 answer
382 views

finite quotients of fundamental groups in positive characteristic