Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On class number relations, intersections, and GL(2)-tale over the
  function field side   The aim of this paper is to study class number relations over function fields
and the intersections of Hirzebruch-Zagier type divisors on the
Drinfeld-Stuhler modular surfaces. The main bridge is a particular "harmonic"
theta series with nebentypus. Using the strong approximation theorem, the
Fourier coefficients of this series are expressed in two ways; one comes from
modified Hurwitz class numbers and another gives the intersection numbers in
question. An elaboration of this approach enables us to interpret these class
numbers as a "mass sum" over the CM points on the Drinfeld-Stuhler modular
curves, and even realize the generating function as a metaplectic automorphic
form.

18
The categories of this paper are: econ
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin