Giovanni Girolamo Saccheri

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Saccheri, Giovanni Girolamo

 

Born Sept. 5, 1667, in San Remo; died Oct. 25, 1733, in Milan. Italian scientist. Jesuit.

Saccheri taught theology and mathematics at Jesuit colleges in Turin, Pavia, and Milan. He attempted to prove Euclid’s parallel postulate by denying it and seeking a resulting contradiction, but his efforts were doomed to failure (seeLOBACHEVSKIAN GEOMETRY). Saccheri derived some theorems that were rediscovered by A. Legendre, and he in effect discovered some basic propositions of non-Euclidean geometry.

WORKS

Euclides ab omni naevo vindicatus; sive conatus geometricus quo stabiliun-turprima ipsa universaegeometriaeprincipia. Milan, 1733.
References in periodicals archive ?
He then skips forward to the Enlightenment, continuing the discussion through to the 20th century in chapters on Francois Viete, Rene Descartes, Gerard Desargues, Giovanni Saccheri, Johann Lambert, Nicolai Lobachevski and Janos Bolyai, Bernhard Riemann, Jean-Victor Poncelet, and Felix Klein.