Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 2+1-Gravity and The Embedding its Dynamiycal Symmetry and
  Para-Supersymmetry into SO(4,c) Group   Some special solutions of the Einstein-Maxwell action with a non-negative
cosmological constant and a very heavy point mass particle have been obtained.
The solutions correspond to static spacetime of locally constant curvature in
its spatial part and a constant magnetic field of a magnetic monopole together
with deficit of angle at the location of point mass. The quantum mechanics of a
point particle in these spacetimes in the absence of angular deficit has been
solved algebraically both relativistically and non-relativistically. It has
been also shown that these 2-dimensional Hamiltonians have the degeneracy group
of GL(2,c) type and para-supersymmetry of arbitrary order or shape invariance,
which is originated from a SO(4,c) group.

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The categories of this paper are: supr-con
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int