Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Harmonic Analysis on the Positive Rationals I: Basic Results   This is the first of two coupled papers estimating the mean values of
multiplicative functions, of unknown support, on arithmetic progressions with
large differences. Applications are made to the study of primes in arithmetic
progression and to the Fourier coefficients of automorphic cusp forms.

15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex