Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Combinatorial applications of the Hodge-Riemann relations   Why do natural and interesting sequences often turn out to be log-concave? We
give one of many possible explanations, from the viewpoint of "standard
conjectures". We illustrate with several examples from combinatorics.

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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: chem-ph