Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exactly and Quasi-Exactly Solvable Models on the Basis of $osp(2|1)$   The exactly and quasi-exactly solvable problems for spin one-half in one
dimension on the basis of a hidden dynamical symmetry algebra of Hamiltonian
are discussed. We take the supergroup, $OSP(2|1)$, as such a symmetry. A number
of exactly solvable examples are considered and their spectrum are evaluated
explicitly. Also, a class of quasi-exactly solvable problems on the basis of
such a symmetry has been obtained.

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The categories of this paper are: ao-sci
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: nlin
23
The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
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The categories of this paper are: physics
2
The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn