Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Integral Representation for the Product of Two Parabolic Cylinder
  Functions $D_\nu (x) D_\nu (-x)$ at $Re \nu <0$ by Means of the Fundamental
  Solution of a Landau-Type Operator   The fundamental solution (Green's function) of a first order matrix ordinary
differential equation arising in a Landau-type problem is calculated by two
methods. The coincidence of the two representations results in the integral
formula for the product of two parabolic cylinder functions $D_\nu(x)
D_\nu(-x)$ at $Re \nu <0$, $x$ is real.

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The categories of this paper are: astro-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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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: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th