Felix Klein
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"Christian Felix Klein" was a Germany/German mathematician, known for his work in group theory, complex analysis, non-Euclidean geometry, and on the connections between geometry and group theory. His 1872 Erlangen program/Erlangen Program, classifying geometries by their underlying symmetry group (mathematics)/groups, was a hugely influential synthesis of much of the mathematics of the day.

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

The developing science departs at the same time more and more from its original scope and purpose and threatens to sacrifice its earlier unity and split into diverse branches.

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