The previous lecture in this series is here. The next lecture in this series is here.
We first show that the number of zeros of a (level 1 holomorphic) modular form in a fundamental domain is weight/12, and use this to show that the graded ring of modular forms is the ring of polynomials in E4 and E6.
This video is part of a lecture course by Richard Borcherds from 2021.