Steiner, Jakob(yä`kôp shtī`nər), 1796–1863, Swiss mathematician. He was largely self-taught and was professor of geometry at the Univ. of Berlin from 1834. A pioneer in the development of synthetic, or pure, geometry (i.e., deduced by axiomatic methods, as Euclid's geometry), particularly projective geometry, he was considered by many the greatest geometer since Apollonius of PergaApollonius of Perga,
fl. 247–205 B.C., Greek mathematician of the Alexandrian school. He produced a treatise on conic sections that included, as well as his own work, much of the work of his predecessors, among whom was Euclid.
..... Click the link for more information. and exerted an important influence on his students, who included Bernhard RiemannRiemann, Bernhard
(Georg Friedrich Bernhard Riemann) , 1826–66, German mathematician. He studied at the universities of Göttingen and Berlin and was professor at Göttingen from 1859.
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Born Mar. 18, 1796, in Utzenstorf; died Apr. 1, 1863, in Bern. Swiss geometer; one of the founders of projective geometry. Member of the Berlin Academy of Sciences (1834).
Steiner became a professor at the University of Berlin in 1835. He refined and systematized the use of projective methods to build complex geometric structures from simpler ones. Steiner was the author of Systematic Development of the Dependence of Geometric Forms on One Another (part 1, 1832) and The Geometric Constructions Executed by Means of the Straight Line and a Fixed Circle (1833; Russian translation, 1939).