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Felix Klein was a German mathematician known for his work in geometry and the development of the Klein bottle, a non-orientable surface. His contributions to mathematics included significant advancements in the field of group theory and the study of geometric structures. Klein's work has had a lasting impact on mathematical research and education, and his concepts remain influential in the study of geometry and topology.

"The greatest mathematicians, as Archimedes, Newton, and Gauss, always united theory and applications in equal measure."



"Everyone knows what a curve is, until he has studied enough mathematics to become confused through the countless number of possible exceptions."



"Thus, in a sense, mathematics has been most advanced by those who distinguished themselves by intuition rather than by rigorous proofs."


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