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Generalized quasi-shuffle products

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arxiv 2303.12386 v1 pith:TIQ7PT6Q submitted 2023-03-22 math.NT math.CO

classification math.NTmath.CO
keywords productsproductquasi-shuffleshufflegeneralizationgeneralizedmultiplenotion
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abstract

In this paper, we introduce the notion of generalized quasi-shuffle products and give a criterion for their associativity. These extend the quasi-shuffle products introduced by Hoffman, which are often used to describe the stuffle and shuffle product for multiple zeta values. For $q$-analogues of multiple zeta values, the description of an analogue for the shuffle product can often not be described with the classical notion of quasi-shuffle products. We show that our generalization gives a natural extension to also include these types of products and we prove a generalization of a duality between the $q$-shuffle product and the $q$-stuffle product.

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  1. Multiple Zeta Values

    math.NT 2026-08 unverdicted novelty 1.0 of 10

    An extensive expository survey of multiple zeta values, their finite/symmetric and q-analogue variants, and their modular-form connections, proving no new theorem.

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