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Linda Tate Young
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Jakob SteinerBorn 18 Mar 1796; died 1 Apr 1863 at age 67.Swiss mathematician who was one of the greatest, contributors to projective geometry. He discovered the Steiner surface which has a double infinity of conic sections on it. The Steiner theorem states that the two pencils by which a conic is projected from two of its points are projectively related. He is also known for the PonceletSteiner theorem which shows that only one given circle and a straight edge are required for Euclidean constructions. His work included conic sections and surfaces, the theory of seconddegree surfaces and centreofgravity problems. He developed the principle of symmetrization (184041). In 1848 he ws the first to define various polar curves with respect to a given curve, and introduced the “Steiner Curves.”« 