 By relying on the psychology of types by the notorious Marburg psychologist Jaensch he then went on to oppose Jewish/Latin and German psychological types. The fault line, so to speak, was between a mathematics driven by intuition, typical of German mathematics, and the formalism allegedly espoused by the Jewish/Latin mathematicians. Obviously, Bieberbach was forced to do a lot of gerrymandering to make sure that important German mathematicians did not end up on the wrong side of the equation (see what he says of Weierstrass, Euler and Hilbert). The basis of these mathematical differences was to be found in racial characteristics: