Uploaded March 2021 | Updated September 2026, 2 weeks ago

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This lecture is part of an online graduate course on modular forms.

We discuss the infinite product of the discriminant function and relate it to the fact that the Eisenstein series E2 is not quite a modular form. We then sketch Siegel's proof of the infinite product for the discriminant.

For the other lectures in the course see youtube.com/playlist?list=PL8yHsr3EFj51HisRtNyzHX-Xyg6I3Wl2F