Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On a new approach to the problem of the zero distribution of
  Hermite-Pad\'e polynomials for a Nikishin system   A new approach to the problem of the zero distribution of Hermite-Pad\'e
polynomials of type I for a pair of functions $f_1,f_2$ forming a Nikishin
system is discussed. Unlike the traditional vector approach, we give an answer
in terms of a scalar equilibrium problem with harmonic external field, which is
posed on a two-sheeted Riemann surface.

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The categories of this paper are: astro-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
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The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol