**Felix Christian Klein**, German

mathematician, born:

April 25 1849 in

Düsseldorf,

Germany, died:

June 22,

1925 in

Göttingen.

He was a professor at the Universities of Erlangen, Munich, Leipzig and finally Göttingen, teaching mathematics. His major topics were non-Euclidean geometry, group theory and function theory. His enunciation of the Erlangen programme classifying geometries by their underlying group of symmetries was hugely influential: a synthesis of much of the mathematics of its time.

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