Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 50 years in the Landau Institute environment   It is impossible to review all the fundamental works of Landau Institute,
which made important contribution to physics in general. Here I will discuss
only a part of these works, only those which directly influence my own work
during 50 years (1968-2018). Khalatnikov created the unique Institute, where
practically all important areas of theoretical physics have been represented,
opening broad possibilities for collaboration. The multidisciplinary
environment of the Landau Institute was the main element of inspiration.

7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an