Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct and inverse approximation theorems in the
  Besicovitch-Museilak-Orlicz spaces of almost periodic functions   In terms of the best approximations of functions and generalized moduli of
smoothness, direct and inverse approximation theorems are proved for
Besicovitch almost periodic functions whose Fourier exponent sequences have a
single limit point in infinity and their Orlicz norms are finite. Special
attention is paid to the study of cases when the constants in these theorems
are unimprovable.

10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org