Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Physics of vacuum at ITEP and around   Recollections about a few episodes from the history of physics of vacuum,
connected with the names of Pomeranchuk, Landau, Zeldovich, Sakharov and
Kirzhnits. The text of the talk will be published in the Proceedings of the
International Conference ``From the Smallest to the Largest Distances'',
Tribute to Jean Tran-Thanh-Van, May 24-26, 2001 (``Surveys in High Energy
Physics'', Taylor and Francis, 2002, v.16, No.3).

31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga