Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: National Seminar: Positron Annihilation   Deliberations in the National Seminar held on 9-10 February, 2007 at Saha
Institute of Nuclear Physics, Kolkata, INDIA

36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
2
The categories of this paper are: math
19
The categories of this paper are: eess