Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: From PCM to KDV and Back   This is a summary of progress made in understanding the occurrence and
properties of local, conserved, commuting charges in non-linear sigma-models,
including principal chiral models (PCMs) and WZW models. (Contribution to the
NATO-ASI meeting: Integrable Hierarchies and Modern Physical Theories,
University of Illinois at Chicago, July 2000.)

36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int