Paolo Ruffini

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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Ruffini, Paolo


Born Sept. 23, 1765, in Valentano, near Viterbo; died May 10, 1822, in Modena. Italian mathematician.

Ruffini published in 1804 a method for the approximate calculation of the real roots of algebraic equations, which was rediscovered in 1819 by the English mathematician W. Horner. In 1799 he gave the first proof that the general algebraic equation of degree five cannot be solved by radicals; his proof, however, was not rigorous. Ruffini also worked out a number of ideas of the theory of finite substitution groups.


Opera matematiche, vols. 1–2. Palermo, 1915–43.


Wileitner, H. Istoriia matematiki ot Dekarta do serediny XIX stoletiia, 2nd ed. Moscow, 1966. (Translated from German.)
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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