Realizations of the formal double Eisenstein space
Realizations of the formal double Eisenstein space
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形式双爱森斯坦空间的实现
DOI:
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发表时间:
2021
期刊:
影响因子:
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通讯作者:
Nils Matthes
中科院分区:
文献类型:
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作者:
Henrik Bachmann;Ulf Kuhn;Nils Matthes
. We introduce the formal double Eisenstein space E k , which is a generaliza-tion of the formal double zeta space D k of Gangl–Kaneko–Zagier, and prove analogues of the sum formula and parity result for formal double Eisenstein series. We show that Q -linear maps E k → A , for some Q -algebra A , can be constructed from formal Laurent series (with coefficients in A ) that satisfy the Fay identity. As the prototypical example, we define the Kronecker realization ρ K : E k → Q [[ q ]], which lifts Gangl–Kaneko–Zagier’s Bernoulli realization ρ B : D k → Q , and whose image consists of quasimodular forms for the full modular group. As an application to the theory of modular forms, we obtain a purely combinatorial proof of Ramanujan’s differential equations for classical Eisenstein series.
DOI:
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发表时间:
2022
期刊:
影响因子:
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作者:
Suzuki Chiharu;Shirai Nobu;Sasaki Kyoshiro;Yamada Yuki;Imura Tomoko;Yamagishi Ryo;Henrik Bachmann
通讯作者:
Henrik Bachmann