Felix Klein was a German mathematician who had a profound impact on the field of mathematics. He made significant contributions to geometry, mathematical physics, and mathematical education. Klein is best known for his Erlangen Program, which proposed that mathematics should be divided into three parts: geometry, mathematical physics, and pure mathematics. He also founded Klein geometry, which had a significant influence on the development of mathematics in the 20th century.
Source: The Evanston Colloquium: Lectures on Mathematics Delivered from Aug. 28 to Sept. 9, 1893 Before Members of the Congress of Mathematics Held in Connection with the World's Fair in Chicago at Northwestern University, Evanston, Ill
Source: The Evanston Colloquium: Lectures on Mathematics Delivered from Aug. 28 to Sept. 9, 1893 Before Members of the Congress of Mathematics Held in Connection with the World's Fair in Chicago at Northwestern University, Evanston, Ill
Source: Gesammelte mathematische Abhandlungen: Zur anschaulichen Geometrie. Zur Auflösung algebraischer Gleichungen. Physikalisches. Hrsg. von R. Fricke und H. Vermeil