Topology IV.b - homotopy theory

Homework for the semi-flipped class: I would like you to read Section 1 of Chapter 2 about higher homotopy groups: the definition, the interpretation of the group law in terms of the pinch and fold maps, and the fact that they are abelian (except the fundamental group). Alternatively this corresponds to 30 minutes of this video:

https://mediaspace.epfl.ch/media/Higher+Homotopy+Groups%2C+Lecture+03.1/0_gx33p99q/29340

We will start the lecture by reviewing the most important parts of this and don't hesitate to write down your questions, so we can discuss them in class.