Selecta Mathematica - Karl Menger - Google Books

http://books.google.de/books?id=kWVMlsqDYwoC&pg=PA469&dq=symmetrale&as_brr=3

Karl Menger, one of the founders of dimension theory, is among the most original mathematicians and thinkers of the twentieth century. He was a member of the Vienna Circle and the founder of its mathematical equivalent, the Viennese Mathematical…