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A generalization of formal multiple zeta values related to multiple Eisenstein series and multiple q-zeta values (2307.02370v1)

Published 5 Jul 2023 in math.NT, math.CO, and math.QA

Abstract: We introduce the algebra $\mathcal{G}{\operatorname{f}}$, which is equipped with natural maps into the algebra of (combinatorial) multiple Eisenstein series and that of multiple q-zeta values. Similar to Racinet's approach to formal multiple zeta values, we consider an affine scheme BM corresponding to the algebra $\mathcal{G}{\operatorname{f}}$. We show that Racinet's affine scheme DM represented by the algebra of formal multiple zeta values embeds into this affine scheme BM. This leads to a projection from the algebra $\mathcal{G}{\operatorname{f}}$ onto the algebra of formal multiple zeta values. Via the above natural maps, this projection corresponds to taking the constant terms of multiple Eisenstein series or the limit $q\to1$ of multiple q-zeta values.

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