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Published in:

2015 | OriginalPaper | Chapter

# Introduction to Modular Forms

Author: Simon C. F. Rose

Publisher: Springer New York

## Abstract

We introduce the notion of modular forms, focusing primarily on the group $$PSL_{2}\mathbb{Z}$$. We further introduce quasi-modular forms, as well as discuss their relation to physics and their applications in a variety of enumerative problems. These notes are based on a lecture given at the Field’s Institute during the thematic program on Calabi-Yau Varieties: Arithmetic, Geometry, and Physics.
Footnotes
1
Note that in this double sum we should exclude the (m, n) = (0, 0) term.

2
This is why we choose this particular normalization.

3
This actually requires an extension of the notion of modularity to (a) deal with characters of the group Γ and (b) to deal with forms of half-integer wieght. However, for the case at hand (r = 8), no such generalization is needed.

4
Note that we are using the non-holomorphic extension of $$E_{2}(\tau )$$ so that this is well-defined on $$\mathcal{M}_{\mathbb{C}}^{E}$$.

5
There is of course the factor of q 1∕2 in the first term which does break modularity. However, we can easily include this into the definition of the function, and end up with a modular form as we desire.

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Metadata
Title
Introduction to Modular Forms
Author
Simon C. F. Rose
Copyright Year
2015
Publisher
Springer New York
DOI
https://doi.org/10.1007/978-1-4939-2830-9_12