Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Update of the phase-shift analysis of the low-energy $\pi N$ data   This paper presents the results of an updated phase-shift analysis of the
low-energy (pion laboratory kinetic energy $T \leq 100$ MeV) pion-nucleon data;
this solution will be referred to as `ZRH20'.

2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn