A Symbolic Summation Approach to Find Optimal Nested Sum Representations

Abstract

We consider the following problem: Given a nested sum expression, find a sum representation such that the nested depth is minimal. We obtain a symbolic summation framework that solves this problem for sums defined, e.g., over hypergeometric, $q$-hypergeometric or mixed hypergeometric expressions. Recently, our methods have found applications in quantum field theory.

To appear in Clay Mathematics Proceedings

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