Paolo Ruffini


Also found in: Wikipedia.

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.

WORKS

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

REFERENCE

Wileitner, H. Istoriia matematiki ot Dekarta do serediny XIX stoletiia, 2nd ed. Moscow, 1966. (Translated from German.)
References in periodicals archive ?
The voice cast Gabriele Caprio, Rocco Papaleo, Paolo Ruffini, Micheli Maurizio and Pino Quartullo all do a fantastic job at adding the layers which keep the youngsters gripped.
The big screen this year will also feature Robert Redford in The Company You Keep, Denzel Washington in Flight, Catherine Frot in Haute Cuisine, Abbas Kirostami with his latest Like Someone In Love and Paolo Ruffini in Pinocchio.