I study physics at the "Technische Universität Darmstadt", but I spend most time doing math. My favorite topics are Topology and Algebra, even though my knowledge there is strictly limitated.
Q&A for people studying math at any level and professionals in related fields
Q&A for users of Mathematica
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Q&A for speakers of German wanting to discuss the finer points of the language and translation