Felix Klein

Felix Christian Klein (April 25, 1849 –  June 22, 1925) was a German mathematician, known for his work in group theory, function theory, non-Euclidean geometry, and on the connections between geometry and group theory. His 1872 Erlangen Program, classifying geometries by their underlying symmetry groups, was a hugely influential synthesis of much of the mathematics of the day.
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Noun
1. German mathematician who created the Klein bottle (1849-1925)
(synonym) Klein
(hypernym) mathematician