"From outside Germany, Klein epitomized the cultured German elite. Self-assured, handsome, highly educated, and marrie…"

"Es ist eine Mannigfaltigkeit und in derselben eine Transformationsgruppe gegeben; man soll die Mannigfaltigkeit angeh…"

"The theory of binary forms and the projective geometry of systems of points on a conic are one and the same, i.e., to…"

"In ordinary geometry a surface is conceived as a locus of points; in Lie's geometry it appears as the totality of all…"

"It has been the final aim of Lie from the beginning to make progress in the theory of differential equations ..."

"As regards quartic surfaces, Rohn has investigated an enormous number of special cases; but a complete enumeration he…"

"Next to the elementary transcental functions the elliptic functions are usually regarded as the most important. There…"

"The proof that π is a transcental number will forerver mark an epoch in mathematical science. It gives the final answ…"

"With Klein, even politics has been introduced into the question: he asserts that “It would seem as if a strong naive …"

"Ehrenfest had always emphasized the importance of Klein's lectures to his students, and we read many of those that ci…"