Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Asymptotic zero distribution of multiple orthogonal polynomials
  associated with Macdonald functions   We study the asymptotic zero distribution of type II multiple orthogonal
polynomials associated with two Macdonald functions (modified Bessel functions
of the second kind). Based on the four-term recurrence relation, it is shown
that, after proper scaling, the sequence of normalized zero counting measures
converges weakly to the first component of a vector of two measures which
satisfies a vector equilibrium problem with two external fields. We also give
the explicit formula for the equilibrium vector in terms of solutions of an
algebraic equation.

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The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: econ
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: solv-int