Today, I was a bit more productive than other days: the class on Graph Theory covered Matchings and I could prove half of Berge's theorem on Maximum Matchings. One might ask: "gee, only half the theorem" and yes, it was only the "easy" part of the theorem, but I made clear that all steps were understood (or, at least, accepted) by my students. They aren't trained with formal proofs, unfortunately.

I also got in touch with developers of the Debian TeX, which has the presence of some upstream developers of TeX Live. The main thing to get in contact with them is that I started teaching some students of mine how to deal with LaTeX, the wonderful infra-structure proviced by CTAN, the TeX Catalogue OnLine and how Debian works in general.