DEDEKIND, JULIUS WILHELM RICHARD (1831 1916), German mathematician, was born at Brunswick on Oct. 6, 1831. He studied at Gottingen, where he obtained his doctorate in 1852. After holding various minor posts he became professor of mathematics at the Technische Hochschule at Brunswick in He died at Brunswick on Feb. 12, 1916. Dedekind's most impor tant work, Stetigkeit and irrationale Zahlen (1872), deals with the theory of ideal numbers. He wrote a preface to the • collected works of Riemann (1876), and edited Dirichlet's researches on the theory of numbers. The later editions of this work have an appendix containing Dedekind's own work on ideal primes. He was also the author of a memoir on the vibrations of a liquid ellipsoid.