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A modular form $f$ satisfies a transformation property for a group $\Gamma$, which relates the value of $f$ at a point in its domain with the value of $f$ at the point transformed under the action of $\Gamma$ on the domain.

For example in the classical case of $\Gamma = \SL(2,\Z)$, a modular form $f:$$\mathcal{H}$$\rightarrow\C$ satisfies the transformation $f(\gamma z) = f\left(\frac{az+b}{cz+d}\right)= v(\gamma)(cz+d)^kf(z),$
for all $z\in\mathcal{H}$, $\gamma=\left(\begin{array}{ll}a&b\\c&d\end{array}\right)\in$$\SL_2(\Z)$ and multiplier system $v$.

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• Review status: reviewed
• Last edited by David Farmer on 2019-05-01 11:11:02
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