Giovanni Girolamo Saccheri

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 It might be outdated or ideologically biased.

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.


Euclides ab omni naevo vindicatus; sive conatus geometricus quo stabiliun-turprima ipsa universaegeometriaeprincipia. Milan, 1733.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
As populations decrease in population size, decreased heterozygosity due to inbreeding depression can reduce fitness (Reed and Frankham, 2003), which can lead to rapid extinction (Geist, 2009; Saccheri et al., 1989).
Professor Ilik Saccheri, Professor of Ecological Genetics at theUniversity of Liverpool,said moths always remained the same size and were not any bigger than usual this year.
Ilik Saccheri, Professor of Ecological Genetics at the University of Liverpool, said moths always remained the same size and were not any bigger than usual this year.
Saccheri et al., "Intra-tumoral Salmonella typhimurium induces a systemic anti-tumor immune response that is directed by low-dose radiation to treat distal disease," European Journal of Immunology, vol.
Reduced genetic diversity, coupled with inbreeding, may negatively impacted a species' fitness and ability to respond to environmental stochasticity (Saccheri et al.
"There aren't really any genes that scream out to you, 'I'm involved in wing patterning,'" says evolutionary geneticist Ilik Saccheri of the University of Liverpool in England.
Van't Hof AE, Nguyen P, Dalfkova M, Edmonds N, Marec F, Saccheri IJ.
(2.) Solari R, Corti M, Cangelosi D, Escudero M, Negroni R, Saccheri C, et al.