LUIGI BIANCHI ( 1856 - 1928 ) était un mathématicien italien . Il est né à Parme, en Émilie-Romagne, et est mort à Pise. Il a été un membre de premier plan de l'école géométrique vigoureuse qui a prospéré en Italie au cours des dernières années du 19th siècle et des premières années du XXe siècle. Gravure portrait par Giuseppe Martelli 8 1928 ca) . En 1898, Bianchi a élaboré la classification Bianchi de neuf classes d'isométrie possibles de groupes de lie tridimensionnels d'isométries d'un manifold riemannien (suffisamment symétrique). Comme le savait Bianchi, c'est essentiellement la même chose que classifier, u

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• Date de la prise de vue: 1856

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LUIGI BIANCHI ( 1856 - 1928 ) was an Italian mathematician . He was born in Parma, Emilia-Romagna, and died in Pisa. He was a leading member of the vigorous geometric school which flourished in Italy during the later years of the 19th century and the early years of the twentieth century. Engraving portrait by Giuseppe Martelli 8 1928 ca) . In 1898, Bianchi worked out the Bianchi classification of nine possible isometry classes of three-dimensional Lie groups of isometries of a (sufficiently symmetric) Riemannian manifold. As Bianchi knew, this is essentially the same thing as classifying, up to isomorphism, the three-dimensional real Lie algebras. This complements the earlier work of Lie himself, who had earlier classified the complex Lie algebras . Through the influence of Luther P. Eisenhart and Abraham Haskel Taub, Bianchi's classification later came to play an important role in the development of the theory of general relativity. Bianchi's list of nine isometry classes, which can be regarded as Lie algebras, Lie groups, or as three dimensional homogeneous (possibly nonisotropic) Riemannian manifolds, are now often called collectively the Bianchi groups . n 1902, Bianchi rediscovered what are now called the Bianchi identities for the Riemann tensor, which play an even more important role in general relativity. (They are essential for understanding the Einstein field equation.) According to Tullio Levi-Civita, these identities had first been discovered by Ricci in about 1880, but Ricci apparently forgot all about the matter, which led to Bianchi's rediscovery - foto storiche - foto storica - scienziato - scientist - portrait - ritratto - baffi - moustache - MATHEMATIC - MATEMATICA - MATEMATICO - scienziato - genius - genio - ALGEBRA - CALCOLO ALGEBRICO ---- Archivio GBB Argenzia

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