Prof. Matoušek [1] was arguably one of Europe's best dual scientists/textbook writers of his time. If you are a math/CS theory persond and you are interested in picking up a book of his, I recommend "Mathematics++: Selected Topics Beyond the Basic Courses" [2].
His full titles were prof. RNDr. Jiří Matoušek, DrSc; where the "DrSc" part was more than what is now recognized as a PhD. Scientific titles used to work differently in Eastern Europe.
Yay! I had a course with Prof. Matoušek: Topological methods in combinatorics and geometry. It a was mostly about using Borsuk Ulam theorem to prove other theorems in different areas. Can't remember a whole lot, except it was fascinating and beautiful.
Ah yeah and of course at least a bit of Borsuk Ulam. In my own words: "for every continuous function from the n-sphere to R^n, there exists a pair of antipodal points on that sphere that will map to the same point in R^n". Example in 1-D: in a heated a metal-ring with some heat-distribution on it, there are to points exactly opposite from each other which have the same temperature.
[1]: https://en.wikipedia.org/wiki/Ji%C5%99%C3%AD_Matou%C5%A1ek_(...
[2]: https://bookstore.ams.org/stml-75
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Also, can't help myself but mention (in good spirits) that this is a repost:
> 33 Miniatures: Mathematical and Algorithmic Applications of Linear Algebra [pdf] (cuni.cz)
> 2 points by NotOscarWilde on Dec 27, 2013 | past | web