A set of mathematical riddles including dwarves. It is written in German and the difficutly ranges from "Well-known and standard" to "I don't know anybody who knows a complete answer". A star means that the problem is more difficult. Illustrations are by Carina Willbold and Almut Tröller.

These are notes for a short course on general relativity for high school students at the math summer camp 2016 in Violau. Anyway they are here by request and were never made for publication. I will add links to much better documents online whenever I find them. However, this is a somewhat involved topic for younger students so if anybody has ideas or scripts explaining GR to high school students, please send me an email.

- Thesis by Florian Andritsch, Graz, Austria. Contains little mistakes. External link.

They are on Hurwitz numbers and Weil-Petersson volumes. I intend to clean them up and put them into a usable library when I have some time available.

I helped founding the Matheschülerzirkel Augsburg, an organization offering free advanced math courses to high school students in Augsburg and Bavaria. We offer math circles, a large math summer camp as well math olympiads. You can find the website here. The following are a few scripts that I created for this purpose, unfortunately most are in German. However, some of them are not yet finished and a few others we modified quite heavily in order to use them as correspondence letters. Anyway, have fun!

- Conway's soldiers in English
- Gruppentheorie
- Hackenbush, a NIM-like game which is in some sense equivalent to surreal numbers
- Invarianten
- Komplexe Zahlen
- Ungleichungen, not completely finished
- Wahlmathematik, not completely finished
- Graphentheorie, not completely finished
- SET, a somewhat mathematical card game. There are still pictures missing.

During my time at MSU I gave a course on Euclidean geometry for prospective high school teachers. The following are a few sample homework sheets. If you are interested in solutions or exams just let me know.

Although there haven't been any Physics Seminars Leipzig recently I am putting my talks from 2013 and 2014 online. Please note that these are slides only so there was quite a bit more content back then.