Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the correlations of directions in the Euclidean plane   We study the correlations of directions $P_0 P$ in the Euclidean plane, where
$P_0$ is a point in a fixed disc, $P$ is an integer lattice point in the square
$[-Q,Q]^2$, and $Q\to \infty$.

1
The categories of this paper are: cs
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex