Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strongly correlated systems and density matrix renormalization group in
  quantum chemistry   This article is a pedagogical introduction to the density matrix
renormalization group method and its application in quantum chemistry. It
presents the easy-to-understand modern formulation based on matrix product
states. It is written in Czech language.

37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat