Friedrich Engel (mathematician)

Friedrich Engel (1861 to 1941) was a German mathematician, born in Lugau in Saxony as the son of a Lutheran pastor. He studied at the universities of Leipzig and Berlin and took his doctorate at Leipzig in 1883 as a student of Felix Klein. He worked at Leipzig, Greifswald and Giessen, and collaborated with Sophus Lie for much of his life. Together they wrote the three volume Theorie der Transformationsgruppen, published between 1888 and 1893. Engel edited the collected works of Lie and of Hermann Grassmann, and translated the works of Nikolai Lobachevski from Russian into German, which made them more widely accessible. With Paul Stäckel he wrote a history of non-Euclidean geometry, and with his former student Karl Faber a book on first order partial differential equations by the methods of Lie groups. He was president of the Deutsche Mathematiker-Vereinigung in 1910.