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Read through the most famous quotes from Felix Klein
Thus, in a sense, mathematics has been most advanced by those who distinguished themselves by intuition rather than by rigorous proofs. ↗
The greatest mathematicians, as Archimedes, Newton, and Gauss, always united theory and applications in equal measure. ↗
Erster Band; Die gruppentheoretischen Grundlagen (in German) Leipzig: B. Annalen Bd. In the 1890s Klein turned to mathematical physics a subject from which he had never strayed far writing on the gyroscope with Arnold Sommerfeld.
Christian Felix Klein (25 April 1849 – 22 June 1925) was a German mathematician known for his work in group theory complex analysis non-Euclidean geometry and on the connections between geometry and group theory.