Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonlocal Symmetries and Interaction Solutions of the (2+1)-dimensional
  Higher Order Broer-Kaup System   The (2+1)-dimensional higher-order Broer-Kaup (HBK) system is studied by
nonlocal symmetry method and consistent tanh expansion (CTE) method in this
paper. Some exact interaction solutions among different nonlinear excitations
such as solitons, rational waves, periodic waves and corresponding images are
explicitly given.

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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: astro-ph
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th