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AN EXTENSION OF ROHRLICH’S THEOREM TO THE $j$-FUNCTION

Published online by Cambridge University Press:  15 January 2020

KATHRIN BRINGMANN  and
BEN KANE Open the ORCID record for BEN KANE [Opens in a new window]
KATHRIN BRINGMANN
Affiliation:
Mathematical Institute, University of Cologne, Weyertal 86-90, D–50931 Cologne, Germany; kbringma@math.uni-koeln.de
BEN KANE
Affiliation:
Department of Mathematics, University of Hong Kong, Pokfulam, Hong Kong; bkane@hku.hk

Abstract

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We start by recalling the following theorem of Rohrlich [17]. To state it, let $\unicode[STIX]{x1D714}_{\mathfrak{z}}$ denote half of the size of the stabilizer $\unicode[STIX]{x1D6E4}_{\mathfrak{z}}$ of $\mathfrak{z}\in \mathbb{H}$ in $\text{SL}_{2}(\mathbb{Z})$ and for a meromorphic function $f:\mathbb{H}\rightarrow \mathbb{C}$ let $\text{ord}_{\mathfrak{z}}(f)$ be the order of vanishing of $f$ at $\mathfrak{z}$. Moreover, define $\unicode[STIX]{x1D6E5}(z):=q\prod _{n\geqslant 1}(1-q^{n})^{24}$, where $q:=e^{2\unicode[STIX]{x1D70B}iz}$, and set $\unicode[STIX]{x1D55B}(z):=\frac{1}{6}\log (y^{6}|\unicode[STIX]{x1D6E5}(z)|)+1$, where $z=x+iy$. Rohrlich’s theorem may be stated in terms of the Petersson inner product, denoted by $\langle ~,\,\rangle$.

Type
Number Theory
Information
Forum of Mathematics, Sigma , Volume 8 , 2020 , e3
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s) 2020

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