Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Compact Shimura Surfaces   We study surfaces constructed from groups of units in quaternion orders
$\Lambda$ over the integers in real quadratic fields k. A short presentation of
some general theory of such surfaces is given, in particular, we construct
certain ``modular curves'' on the surfaces and examine their properties. We
apply our results to some surfaces related to the case $k=Q(\sqrt{13})$ and
$d(\Lambda)=(3)$, and find their place in the Kodaira classification of
algebraic surfaces.

32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex