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On the Goncharov depth conjecture and a formula for volumes of orthoschemes

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arxiv 2012.05599 v2 pith:SMVTCN6W submitted 2020-12-10 math.AG math.MGmath.NT

classification math.AGmath.MGmath.NT
keywords formulaorthoschemesconjecturedepthdimensiongoncharovhyperbolicarbitrary
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We prove a conjecture of Goncharov, which says that any multiple polylogarithm can be expressed via polylogarithms of depth at most half of the weight. We give an explicit formula for this presentation, involving a summation over trees that correspond to decompositions of a polygon into quadrangles. Our second result is a formula for volume of hyperbolic orthoschemes, generalizing the formula of Lobachevsky in dimension $3$ to an arbitrary dimension. We show a surprising relation between two results, which comes from the fact that hyperbolic orthoschemes are parametrized by configurations of points on $\mathbb{P}^1.$ In particular, we derive both formulas from their common generalization.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Recursive construction of scalar one-loop integrals in dimensional regularisation

    hep-th 2026-07 conditional novelty 8.0 of 10

    A recursion based on hyperbolic simplex volumes expresses every epsilon-expansion coefficient of scalar one-loop Feynman integrals in terms of multiple polylogarithms.

  2. The Hopf algebra of formal multiple polylogarithms

    math.NT 2024-11 conditional novelty 6.0 of 10

    A new Hopf algebra of formal multiple polylogarithms is defined for every field, with Hodge and motivic realizations, proposed as the conjectural Hopf algebra of framed mixed Tate motives.

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