Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Points of order two on theta divisors   We give a bound on the number of points of order two on the theta divisor of
a principally polarized abelian variety A. When A is the Jacobian of a curve C
the result can be applied in estimating the number of effective square roots of
a fixed line bundle on C.

13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin