Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: In memoriam: Dmitri Ivanenko   Dmitri Ivanenko, professor of Moscow State University, was one of the great
theoreticians of XX century, an author of the proton-neutron model of atomic
nucleus. In honor of the 110th Year Anniversary.

17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th