User BD107 - Mathematics Stack Exchange

BD107

Member for 7 years, 10 months
Last seen more than a month ago

14 Questions

Score Activity Newest Views

6 votes

1 answer

1k views

Which line bundles on a product of projective spaces are ample?

asked Mar 4, 2017 at 22:00

6 votes

2 answers

157 views

Limiting behavior of $x + \sqrt{x} - \sqrt{x + \sqrt{x}}$

asked Dec 15, 2020 at 2:12

3 votes

0 answers

89 views

Is there always a prime $p$ which falls short of $2^n$ by at most a square-root factor?

asked Dec 15, 2020 at 18:55

3 votes

1 answer

577 views

If isogenous elliptic curves have equal numbers of points, how can isogenies have non-trivial kernels?

asked Oct 24, 2018 at 19:29

3 votes

0 answers

238 views

How is the Frobenius morphism of a supersingular curve non-integral if its characteristic equation splits over Z?

asked Nov 9, 2018 at 2:48

3 votes

2 answers

852 views

Chow ring of weighted projective space

asked Aug 9, 2016 at 3:10

3 votes

1 answer

1k views

Is the dual of the tautological subbundle on a Grassmannian ample?

asked Jun 5, 2016 at 16:18

2 votes

1 answer

950 views

Tangent bundle of product of projective spaces

asked Aug 8, 2016 at 19:27

2 votes

0 answers

375 views

When is the Chow pull-back of a cycle its preimage?

asked Aug 22, 2016 at 22:34

2 votes

0 answers

105 views

Chern classes of hyper-Kähler fourfolds in Grassmannians

asked Feb 13, 2017 at 16:47

2 votes

0 answers

54 views

U(n) is compact and algebraic, but not abelian—why not a contradiction?

asked Jul 30 at 22:59

1 vote

0 answers

116 views

Moduli space of differential forms

asked May 24, 2016 at 21:44

1 vote

1 answer

154 views

Picard rank of K3s -- How can it be small?

asked May 30, 2016 at 23:39

0 votes

1 answer

309 views

Upper-bound on number of connected components, given maximal degree

asked Feb 1, 2021 at 21:14