The previous lecture in this series is here. The next lecture in this series is here.
Prof. Zhao explains the Ruzsa covering lemma and uses it to prove Freiman’s theorem in groups of bounded exponent. He then explains Freiman homomorphisms, as well as the modelling lemma.
These videos are of a lecture course by Yufei Zhao at the Massachusetts Institute of Technology in 2019, and made available as part of its OpenCourseWare initiative. The website for the course may be found here.