Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: HadAtom99   These are the proceedings of the workshop "HadAtom99", held at the Institut
fuer Theoretische Physik, Universitaet Bern, October 14-15, 1999. The main
topics discussed at the workshop were the physics of hadronic atoms and in this
context recent results from Chiral Perturbation Theory. Included here are the
program, the list of participants and a short summary provided by the speakers.

2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th