Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Energy spectrum of the equal spin-spin interactions Hamiltonian   The energy spectrum of eigenvalues of the equal spin-spin interactions (ESSI)
Hamiltonian has been found. The obtained spectrum is free from limitations
imposed on number of spins and parameters of the ESSI Hamiltonian. This model
can be used for consideration of spin dynamics of mesoscopic systems and
molecules with large number of nuclei spins.

8
The categories of this paper are: hep-ex
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
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat