I felt good about this lecture. Started with the 6-colour theorem, then the 5-colour theorem (which was a bit iffy), and finally the 4-colour theorem. The facial expressions on some students were pretty funny. I guess maybe I told a good story with this development of colourings. The duality was not too bad either. I finally got the chance to show off the cube/octahedron dual with the magnets. This is one that I will point to as one of the better ones in the semester.

There’s one guy who confessed to being from the morning section came to me before and after the lecture to ask questions. Getting students from other sections is a new experience for me, it didn’t happen last semester, and I only know of 2 from 239 last year. This time there were a lot of them…is it really because the morning teacher is bad, or because I’m not so bad? I think it’s the first one…heh.

Mike came into the class and looked like he was stunned. Really weird facial expression from him, which made me laugh a few times while teaching. Students might be wondering why I was laughing for no particular reason. Anyway, I always look to Mike to see if the class understands what I’m saying, so he’s a good help.