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Let $f$ be a function from $\mathcal{H}$ to $\mathbb{C}$. We define the weight $k$ slash-action $f|_k\gamma$ to be the action of $\gamma=\left(\begin{matrix}a&b\\c&d\end{matrix}\right)\in\textrm{SL}_2(\mathbb{R})$ given by $f|_k\gamma(z)=\det(\gamma)^{k/2}(cz+d)^{-k}f(\gamma z).$

Note that, if $f$ is a modular form with multiplier system $v$, the modularity condition is equivalent to $f|_k\gamma(z)=v(\gamma)f(z).$

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• Review status: reviewed
• Last edited by Nathan Ryan on 2019-05-01 11:10:30
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