Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Recent Progress in the Heavy Quark Theory   Some recent developments in the heavy quark theory are briefly reviewed. The
main emphasis is put on interrelation between HQET and OPE. The notion of
duality and deviations from duality are discussed in detail.

13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex