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Rudolff, ChristoffRudolff, Christoff, b. Jawor, Poland (then Jauer), 1500 (?), d. Vienna, 1545, mathematician. Studied under Grammateus in Vienna. Taught privately, not at a university. Was an eminent arithmetical genius and major contributor to the advancement of algebra and arithmetics. He simplified equations with unknown factors and developed a modern set of symbols; introduced the radical sign for square roots. Works: Behend und hübsch Rechnung, 1525; Künstlich rechnung mit der ziffer und den zalpfennigen, 1526; Exempelbüchlein, 1530. Literature: M. Cantor, Vorlesungen über Geschichte der Mathemathik, 4 vols., 1880-1898 (vol. 2); ADB.
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