This channel contains a collection of informal recordings from our 2019-2024 school years. It is intended only for students of these classes, for academic purposes-- e.g., to catch up if you miss a class or if you want to review something that came up in class. The talks are specific to the content and context of these classes and not intended for wider distribution. The views presented are not necessarily those of the instructor or students but intended to represent views one might hold of the original author's statements. (In other words, don't assume that what we say is necessarily what we believe. We're exploring ideas, not indoctrinating.)