Gheorghe Țițeica

Gheorghe Ţiţeica (French Georges Tzitzéica; * 4 Oktoberjul / October 16 1873greg in Turnu Severin, .. † February 5, 1939 in Bucharest ) was a Romanian mathematician. He worked as a high school teacher in Bucharest and dealt with the differential geometry.

Life

Ţiţeica was born in Turnu Severin, while his father was working on the Danube port there. He attended primary school in Turnu Severin and 1885-1892 high school Carol I in Craiova. In 1892 he started with a scholarship a teaching degree and at the same time heard lectures on mathematics at the University of Bucharest. In June 1895, he earned the Bachelor and began in the fall to work as a substitute teacher at the Theological Seminary in Bucharest.

In 1896 he received the state exam for teaching mathematics in secondary schools and went to teach at the Vasile Alecsandri school in Galaţi. He decided to continue his studies in Paris and went in 1896 at the École Normale Supérieure. There he met Henri Lebesgue and Paul Montel know. In 1898 he published his first work Sur un theorems de M. Cosserat, Sur les systèmes orthogonaux and Sur les systèmes cycliques. On June 30, 1899 he defended his thesis Sur les et sur ​​les systèmes congruences cycliques triple ment conjugués before a committee, the board Gaston Darboux.

After the acquisition of the doctoral degree, he returned to Romania and was an assistant professor of differential and integral calculus at the University of Bucharest. On 4 May 1900 he was appointed associate professor of analytical geometry and 1903 as full professor of analytical geometry and spherical trigonometry. This he remained until his death and was parallel 1919-1923 Dean of the Faculty of Science of the University of Bucharest, in 1927 extraordinary professor and in 1928 full professor of calculus at the Polytechnic University of Bucharest. He held in 1926, 1930 and 1937 lectures at the Sorbonne in Paris, 1926 in Brussels and 1937 in Rome.

The Romanian Academy elected him a corresponding member in May 1909 and 1913 as the successor of the mathematician Spiru Haret a full member. He was from 1922 to 1925 Vice President of the Natural Sciences, 1928-1929 Vice President and from 1929 until his death, Secretary General of the Romanian Academy. 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 in 1934 and received an honorary doctorate from the University of Warsaw.

Ţiţeicas scientific work relates to surfaces, curves, and the power and Kongruenztheorie. Ţiţeica surfaces are defined by the constant ratio, wherein the curvature at a point M and the distance to the tangent plane through a fixed point m. Ţiţeica curves are defined by the constant ratio, wherein the coil at a point M and the distance to a fixed point by Oskulationsebene m.

He was married to a Swiss musician and had three children: Radu, Gabriela Şerban and. Both sons were physicists, the daughter of a mathematician. The Romanian Academy planned posthumous reprint all work Ţiţeicas in several volumes. The first volume appeared in 1941 under the title oeuvre de Georges Tzitzéica, publiées par l' Académie roumaine, more volumes are not published.