Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Progress and Issues in the Electromagnetic Production of Kaon on the
  Nucleon   The present status of kaon photo- and electroproduction on the nucleon is
briefly reviewed. Some current important issues in this field are discussed.

3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess