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I know this isn't a discussion of his subject matter but I love his presentation format.

Thanks! In fact, I originally wanted to write a classic paper, but I realized that ...

* The subject isn't complex enough to really fill a paper.

* Whenever I want to talk to someone about this, presentation slides are very handy in contrast to continuous text.

* The audience are people in the web, who look at it on screen and won't print it.

In addition, I was inspired by other mathematical slides such as http://www.tu-harburg.de/~matjz/work/lectures/ZAemB.pdf

I was thinking the exact same thing. This is a rare example of an appropriate use of the PowerPoint medium.

More exactly, it's the "beamer" package of LaTeX, not PowerPoint.