Gheorghe Țițeica

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Gheorghe Țițeica (Romanian postage stamp 1961)

Gheorghe Țițeica (French Georges Tzitzéica ; * 4th October July / 16 October  1873 greg. In Turnu Severin ; † February 5, 1939 in Bucharest ) was a Romanian mathematician . He worked as a university teacher in Bucharest and dealt with differential geometry .

Life

Țițeica was born in Turnu Severin while his father was a worker there at the Danube port. He attended the elementary school in Turnu Severin and from 1885 to 1892 the high school Carol I in Craiova . In 1892 he began to study teaching with the help of a scholarship and at the same time attended lectures on mathematics at the University of Bucharest . In June 1895 he received his bachelor's degree and in the autumn began to work as a substitute teacher at the theological seminary in Bucharest.

In 1896 he received the state examination for teaching in mathematics in secondary schools and went as a teacher at the Vasile Alecsandri School in Galați . He decided to continue his studies in Paris and in 1896 went to the École normal supérieure . There he met Henri Léon Lebesgue and Paul Montel . In 1898 he published his first work Sur un théorème de M. Cosserat , Sur les systèmes orthogonaux and Sur les systèmes cycliques . On June 30, 1899, he defended his dissertation Sur les congruences cycliques et sur les systèmes triplement conjugués before a commission headed by Gaston Darboux .

After earning his doctorate, he returned to Romania and became assistant professor for differential and integral calculus at the University of Bucharest. On May 4, 1900 he was appointed associate professor for analytical geometry and in 1903 full professor for analytical geometry and spherical trigonometry . He remained this until his death and was simultaneously dean of the natural science faculty of the University of Bucharest from 1919 to 1923, from 1927 an extraordinary professor and from 1928 a full professor of calculus at the Bucharest Polytechnic . He gave guest lectures at the Sorbonne in Paris in 1926, 1930 and 1937 , in Brussels in 1926 and in Rome in 1937 .

The Romanian Academy elected him in May 1909 as a corresponding member and in 1913 as the successor to the mathematician Spiru Haret as a full member. He was Vice President of the Science Class from 1922 to 1925, Vice President from 1928 to 1929 and Secretary General of the Romanian Academy from 1929 until his death. In 1930 he was elected a corresponding member of the Maryland Academy of Sciences and in 1934 a member of the Société royale des sciences de Liège and in 1934 received an honorary doctorate from the University of Warsaw .

Țițeica's scientific work concerns surfaces , algebraic curves, and mesh and congruence theory . Țițeica surfaces are defined by the constant ratio , where the curvature is at a point M and the distance from a fixed point to the tangential plane is through M. Țițeica curves are defined by the constant ratio , where the turn is at a point M and the distance from a fixed point to the osculation plane is through M.

He was married to a Swiss musician and had three children: Radu, Gabriela and Șerban . Both sons became physicists , the daughter a mathematician. The Romanian Academy planned to posthumously reprint all of Țițeica's work in several volumes. The first volume was published in 1941 under the title Œuvres de Georges Tzitzéica, publiées par l'Académie roumaine , no other volumes have appeared.

literature

personal data
SURNAME Țițeica, Gheorghe
ALTERNATIVE NAMES Tzitzéica, Georges
BRIEF DESCRIPTION Romanian mathematician
DATE OF BIRTH October 16, 1873
PLACE OF BIRTH Turnu Severin
DATE OF DEATH February 5, 1939
Place of death Bucharest