Dimitri Fedorovich Egorov (Russian: Дмитрий Фёдорович Егоров, December 22, 1869 - September 10, 1931) was a Russian mathematician born in Moscow. He particularly studied potential surfaces and triply orthogonal systems, and made significant contributions to the broader areas of differential geometry and integral equations. Egorov's work was influential to that of Jean Gaston Darboux on differential geometry and calculus of the infinitesimal. A theorem in real analysis, Egorov's Theorem, is named in his honour. December 22 is the 356th day of the year (357th in leap years) in the Gregorian Calendar. ... 1869 is a common year starting on Friday (link will take you to calendar). ... September 10 is the 253rd day of the year (254th in leap years). ... 1931 (MCMXXXI) is a common year starting on Thursday. ... Moscow (Russian: Москва́, Moskva, IPA: (?)) is the capital of Russia, located on the river Moskva. ... It has been suggested that this article or section be merged with Scalar potential. ... In mathematics, orthogonal is synonymous with perpendicular when used as a simple adjective that is not part of any longer phrase with a standard definition. ... In mathematics, differential topology is the field dealing with differentiable functions on differentiable manifolds. ... In mathematics, an integral equation is an equation in which an unknown function appears under an integral sign. ... Jean Gaston Darboux (August 14, 1842, Nîmes – February 23, 1917, Paris) was a French mathematician. ... Calculus is a central branch of mathematics, developed from algebra and geometry, and built on two major complementary ideas. ... In mathematics, an infinitesimal, or infinitely small number, is a number that is greater in absolute value than zero yet smaller than any positive real number. ... Real analysis is that branch of mathematical analysis dealing with the set of real numbers and functions of real numbers. ...

Egorov held spiritual beliefs to be of great importance, and openly defended the Church against Marxist supporters after the Russian Revolution. He was elected president of the Moscow Mathematical Society in 1921, and became director of the Institute for Mechanics and Mathematics at Moscow State University in 1923. However because of Egorov's stance against the repression of the Church, he was dismissed from the Institute in 1929 and publicly rebuked. In 1930 he was arrested and imprisoned as a "religious sectarian", and soon after was expelled from the Moscow Mathematical Society. Upon imprisonment, Egorov began a hunger strike until he was taken to the prison hospital, and eventually to the house of fellow mathematician Nikolai Chebotaryov where he died. The Revolution *The first was that of the February Revolution of 1917, which displaced the autocracy of Czar Nicholas II of Russia, the last effective czar of Russia, and sought to establish in its place a liberal republic. ... 1921 (MCMXXI) was a common year starting on Saturday (see link for calendar). ... Moscow State University campus M.V. Lomonosov Moscow State University (Russian: Московский Государственный Университет имени М.В.Ломоносова, often abbreviated МГУ, MSU, MGU) is the largest and oldest university in Russia, founded in 1755. ... 1923 (MCMXXIII) was a common year starting on Monday (link will take you to calendar). ... 1929 (MCMXXIX) was a common year starting on Tuesday (link will take you to calendar). ... 1930 (MCMXXX) is a common year starting on Wednesday. ... Nikolai Chebotaryov (1894-1947) was a noted Ukrainian mathematician. ...

References

• John J O'Connor and Edmund F Robertson, 2005. Dimitri Fedorovich Egorov. Retrieved November 21, 2005.

November 21 is the 325th day of the year (326th in leap years) in the Gregorian Calendar. ... 2005 (MMV) is a common year starting on Saturday of the Gregorian calendar. ...

External links

• Genealogy at the Mathematics Genealogy Project