Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Landau's necessary density conditions for the Hankel transform   We will prove an analogue of Landau's necessary conditions [Necessary density
conditions for sampling and interpolation of certain entire functions, Acta
Math. 117 (1967).] for spaces of functions whose Hankel transform is supported
in a measurable subset S of the positive semi-axis. As a special case,
necessary density conditions for the existence of Fourier-Bessel frames are
obtained.

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The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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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: stat
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph