Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reflection identities of harmonic sums up to weight three   We discuss reflections identities of harmonic sums up to weight three. The
need for this kind of identities emerges in analysis of the general structure
of eigenvalue of the BFKL equation. The reflection identities decompose a
product of two harmonic sums with pole singularities at real integer points
into a linear combination of other functions with pole singularities at either
negative integers or zero and positive integers. This provides a pole
separation of expressions with a mixed pole structure.

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The categories of this paper are: supr-con
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The categories of this paper are: cs
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The categories of this paper are: nucl-th
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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: gr-qc
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The categories of this paper are: physics
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: mtrl-th