Abstract
In the first chapter we introduced the theta function of a positive definite quadratic form and discussed its transformation formula under the action of the modular group. We want now to show that the theta function is a modular form.
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Wang, X., Pei, D. (2012). Integers Represented by Positive Definite Quadratic Forms. In: Modular Forms with Integral and Half-Integral Weights. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-29302-3_10
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DOI: https://doi.org/10.1007/978-3-642-29302-3_10
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