Eugene (Eugen) Jahnke

Paul Rudolf Eugen Jahnke ( born November 30, 1861 in Berlin, † October 18, 1921 in Berlin) was a German mathematician.

Jahnke studied mathematics and physics at the Friedrich- Wilhelms- University of Berlin, where he studied under Karl Weierstrass and Lazarus Fuchs and 1886 obtained his state examination for teachers at secondary schools. In 1889 he received his doctorate in Halle an der Saale in Albert Wangerin on the integration of ordinary differential equations first order. After that, he was a teacher at secondary schools in Berlin (including the Friedrichswerder secondary school from 1900), where he at the same time in 1901 habilitation at the Technical University of Berlin -Charlottenburg and from 1905 professor at the Mining Academy in Berlin, which merged in 1916 with the TH Berlin. In 1919 he was rector of the Technical University Berlin.

He was editor of the Archives of Mathematics and Physics and the yearbook staff on the progress of mathematics. He wrote an early book on vector calculus and is now known primarily for its function panels, which first appeared in 1909, was also translated into English and were placed in new machining until the 1960s. They were later edited by Fritz Emde (Professor of Electrical Engineering at the Technical University of Stuttgart ) and others.

Following Ferdinand Caspary he studied from the early 1890s with vector calculus, both of Hermann Grassmann and its extension theory went out, and turned it in publications 1902 and 1904 on the electrodynamics and optics on. Also under the influence of Caspary he wrote papers on the application of theta-functions.

At the mountain academy he also taught mechanics and mining engineering, where he invented a device for controlling the drive of the conveying baskets. He was considered a good teacher and was interested in mathematics education. 1901 to 1918 he was editor of the Archives of Mathematics and Physics. He also issued the Mathematics and Physics journals for engineers and students and as of 1912 Dingler's Polytechnic Journal. He was with Hellmuth Kneser one of the founders of the Berlin Mathematical Society (1901 ).

Writings

• Lectures on Vector Calculus - with applications to geometry, mechanics and mathematical physics. Teubner 1905
• Function tables with formulas and curves, Teubner. 1909, 1933, 1945, 7th edition 1966, edited by Fritz Emde and later by Friedrich erase boards as higher functions