Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Un th\'eor\`eme de Helson pour des s\'eries de Walsh   Extension to Walsh series of theorems of Helson and Katznelson on
trigonometric series, saying that a trigonometric series whose partial sums are
positive has its coefficients tend to zero but is not necessarily a
Fourier-Lebesgue series

22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin