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Simplifying Multiple Sums in Difference Fields

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arxiv 1304.4134 v1 pith:DBDKKUM7 submitted 2013-04-15 cs.SC math-phmath.COmath.MP

classification cs.SCmath-phmath.COmath.MP
keywords differenceproblemssummationalgorithmsfieldfieldspackagesolved
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In this survey article we present difference field algorithms for symbolic summation. Special emphasize is put on new aspects in how the summation problems are rephrased in terms of difference fields, how the problems are solved there, and how the derived results in the given difference field can be reinterpreted as solutions of the input problem. The algorithms are illustrated with the Mathematica package \SigmaP\ by discovering and proving new harmonic number identities extending those from (Paule and Schneider, 2003). In addition, the newly developed package \texttt{EvaluateMultiSums} is introduced that combines the presented tools. In this way, large scale summation problems for the evaluation of Feynman diagrams in QCD (Quantum ChromoDynamics) can be solved completely automatically.

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    The authors construct μ-extensions of iterated integrals and nested sums over multiple alphabets, showing that they map polynomially in μ into the original function space (except for square-root cases) while preservin...

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