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The weight of an elliptic modular form $f$ is the integer or half-integer power of $(cz+d)$ that occurs in the modular transformation property of $f$ under the action of $\gamma = \left( \begin{array}{ll} a & b \\ c & d \end{array}\right)$ on the upper half plane. That is, the weight is the number $k$ in the transformation law $$f\left( \frac{a z + b}{c z + d} \right) = \chi(d)(c z + d)^k f(z) .$$

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• Review status: reviewed
• Last edited by David Farmer on 2019-04-09 22:53:18
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