2) In the Wikipedia article it is written that that "Zweitafelprojektion" is one of the fundamental methods of descriptive geometry, yet such a fundamental concept has no other language options. This seems to be a trend in German Wikipedia regarding many mathematical concepts. Why is that so? Are some German mathematical concepts fundamentally different from their English counterparts? Is there an attempt to keep a more German version of mathematical language which at times is not truly compatible with English?