Ariyan Javanpeykar's user avatar
Ariyan Javanpeykar's user avatar
Ariyan Javanpeykar's user avatar
Ariyan Javanpeykar
  • Member for 14 years, 1 month
  • Last seen this week
11 votes
5 answers
8k views

When is the push-forward of the structure sheaf locally free

24 votes
4 answers
6k views

Extending vector bundles on a given open subscheme

23 votes
1 answer
4k views

GAGA and Chern classes

14 votes
4 answers
4k views

Is the Euler characteristic a birational invariant

20 votes
3 answers
3k views

Are schemes that "have enough locally frees" necessarily separated

10 votes
3 answers
2k views

Where does the splitting principle come from and does it generalize

18 votes
1 answer
2k views

Does the moduli space of genus three curves contain a complete genus two curve

11 votes
1 answer
1k views

How does $f_* O_X$ measure ramification and Grothendieck-Riemann-Roch

6 votes
3 answers
1k views

Is there an obvious way for showing singularities are quotient?

4 votes
2 answers
1k views

For a line bundle L on a smooth projective variety X, what is meant by Pic^L(X)

15 votes
1 answer
1k views

Is the set of surfaces over Spec Z with ample canonical sheaf empty

13 votes
2 answers
1k views

Families of curves for which the Belyi degree can be easily bounded

14 votes
4 answers
1k views

Etale coverings of certain open subschemes in Spec O_K

11 votes
1 answer
1k views

Which curves have stable Faltings height greater or equal to 1

4 votes
1 answer
1k views

Behaviour of euler characteristics in characteristic p for finite etale covers

6 votes
1 answer
1k views

What does the Riemann-Hurwitz formula tell us on the Picard variety

8 votes
1 answer
1k views

Rational singularities for fibered surfaces

9 votes
2 answers
1k views

Bounding the modular discriminant of an elliptic curve in the j-invariant

9 votes
2 answers
969 views

Finite etale atlas for Deligne-Mumford stacks

8 votes
2 answers
954 views

Covers of the projective line over Z and arithmetic Grauert-Remmert

6 votes
2 answers
951 views

Is the desingularization of a normal variety with only quotient singularities projective

3 votes
1 answer
939 views

Perfect complexes and RGamma(X,F) without mentioning derived categories

6 votes
3 answers
929 views

Branch locus of the Galois closure of a Belyi morphism

8 votes
2 answers
905 views

Is this finite surjective flat morphism of 2 dimensional schemes a local complete intersection

22 votes
1 answer
854 views

Is being of general type stable under generization

3 votes
1 answer
852 views

The smallest positive eigenvalue and the length of the shortest geodesic

6 votes
2 answers
849 views

Given a morphism from X to Y, when is the morphism from O_Y to the pushforward of O_X injective

10 votes
1 answer
834 views

$K_0$ of a non-separated scheme

4 votes
2 answers
832 views

Moving a canonical divisor on a normal surface away from the singular locus

7 votes
2 answers
823 views

Can we bound the minimal degree of a field extension required to obtain semi-stable reduction