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Felix Klein
German mathematician, author of the erlangen program (1849-1925).
Born April 25th, 1849 in Düsseldorf.
Died June 22nd, 1925 at 76 years old in Göttingen.
Occupations
historian of mathematics, mathematician, politician, publisher, university teacher
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As you get older, three things happen: The first is your memory goes, and I can't remember the other two. Norman Wisdom