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Alexandru Ghika
Alexandru Ghika (June 22, 1902 – April 11, 1964) was a Romanian mathematician, founder of the Romanian school of functional analysis. Life He was born in Bucharest, into the Ghica family, the son of Ioan Ghika (1873–1949) and Elena Metaxa (1870–1951), and great-great-grandson of Grigore IV Ghica, Prince of Wallachia.Family tree at ghika.org He started his secondary studies at the Gheorghe Lazăr High School in Bucharest. In 1917, he left with his family for , completing his secondary studies at the |
Bucharest
Bucharest ( , ; ro, București ) is the capital and largest city of Romania, as well as its cultural, industrial, and financial centre. It is located in the southeast of the country, on the banks of the Dâmbovița River, less than north of the Danube River and the Bulgarian border. Bucharest was first mentioned in documents in 1459. The city became the capital of Romania in 1862 and is the centre of Romanian media, culture, and art. Its architecture is a mix of historical (mostly Eclectic, but also Neoclassical and Art Nouveau), interbellum ( Bauhaus, Art Deco and Romanian Revival architecture), socialist era, and modern. In the period between the two World Wars, the city's elegant architecture and the sophistication of its elite earned Bucharest the nickname of 'Paris of the East' ( ro, Parisul Estului) or 'Little Paris' ( ro, Micul Paris). Although buildings and districts in the historic city centre were heavily damaged or destroyed by war, earthquakes, and even Nic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Romanian Academy
The Romanian Academy ( ro, Academia Română ) is a cultural forum founded in Bucharest, Romania, in 1866. It covers the scientific, artistic and literary domains. The academy has 181 active members who are elected for life. According to its bylaws, the academy's main goals are the cultivation of Romanian language and Romanian literature, the study of the national history of Romania and research into major scientific domains. Some of the academy's fundamental projects are the Romanian language dictionary (''Dicționarul explicativ al limbii române''), the dictionary of Romanian literature, and the treatise on the history of the Romanian people. History On the initiative of C. A. Rosetti, the Academy was founded on April 1, 1866, as ''Societatea Literară Română''. The founding members were illustrious members of the Romanian society of the age. The name changed to ''Societatea Academică Romînă'' in 1867, and finally to ''Academia Română'' in 1879, during the reign of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hahn–Banach Theorem
The Hahn–Banach theorem is a central tool in functional analysis. It allows the extension of bounded linear functionals defined on a subspace of some vector space to the whole space, and it also shows that there are "enough" continuous linear functionals defined on every normed vector space to make the study of the dual space "interesting". Another version of the Hahn–Banach theorem is known as the Hahn–Banach separation theorem or the hyperplane separation theorem, and has numerous uses in convex geometry. History The theorem is named for the mathematicians Hans Hahn and Stefan Banach, who proved it independently in the late 1920s. The special case of the theorem for the space C[a, b] of continuous functions on an interval was proved earlier (in 1912) by Eduard Helly, and a more general extension theorem, the M. Riesz extension theorem, from which the Hahn–Banach theorem can be derived, was proved in 1923 by Marcel Riesz. The first Hahn–Banach theorem was proved by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordered Ring
In abstract algebra, an ordered ring is a (usually commutative) ring ''R'' with a total order ≤ such that for all ''a'', ''b'', and ''c'' in ''R'': * if ''a'' ≤ ''b'' then ''a'' + ''c'' ≤ ''b'' + ''c''. * if 0 ≤ ''a'' and 0 ≤ ''b'' then 0 ≤ ''ab''. Examples Ordered rings are familiar from arithmetic. Examples include the integers, the rationals and the real numbers. (The rationals and reals in fact form ordered fields.) The complex numbers, in contrast, do not form an ordered ring or field, because there is no inherent order relationship between the elements 1 and ''i''. Positive elements In analogy with the real numbers, we call an element ''c'' of an ordered ring ''R'' positive if 0 < ''c'', and negative if ''c'' < 0. 0 is considered to be neither positive nor negative. The set of positive elements of an ordered ring ''R'' is often denoted by ''R''+. An alternative notation, favored in some disciplines, is to use ''R''+ for the set of non ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cabiria Andreian Cazacu
Cabiria Andreian Cazacu (February 19, 1928 – May 22, 2018) was a Romanian mathematician known for her work in complex analysis. She held the chair in mathematical analysis at the University of Bucharest from 1973 to 1975, and was dean of the faculty of mathematics at the University of Bucharest from 1976 to 1984. Life Andreian Cazacu was born on February 19, 1928, in Iași, the daughter of mathematics teacher Ioan T. Ardeleanu. Towards the end of World War II, her family became refugees in Bucharest, where she completed her high school studies in 1945. She then enrolled in the Faculty of Mathematics at the University of Bucharest, graduating with a B.S. in 1949; her undergraduate thesis, on ''Generalized nilpotent groups'', was written under the guidance of Dan Barbilian. She then continued at the university, first as a teaching assistant and then as a lecturer starting in 1950. She became a student of Simion Stoilow, completing a doctorate in 1955 under his supervision, with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nicolas Bourbaki
Nicolas Bourbaki () is the collective pseudonym of a group of mathematicians, predominantly French alumni of the École normale supérieure (Paris), École normale supérieure - PSL (ENS). Founded in 1934–1935, the Bourbaki group originally intended to prepare a new textbook in mathematical analysis, analysis. Over time the project became much more ambitious, growing into a large series of textbooks published under the Bourbaki name, meant to treat modern pure mathematics. The series is known collectively as the ''Éléments de mathématique'' (''Elements of Mathematics''), the group's central work. Topics treated in the series include set theory, abstract algebra, topology, analysis, Lie groups and Lie algebras. Bourbaki was founded in response to the effects of the First World War which caused the death of a generation of French mathematicians; as a result, young university instructors were forced to use dated texts. While teaching at the University of Strasbourg, Henri Carta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evenimentul Zilei
''Evenimentul Zilei'' is a formerly physical and now exclusively online newspaper in Romania. Its name means "today's even (news)". History and profile ''Evenimentul Zilei'' was founded by Ion Cristoiu, Cornel Nistorescu and Mihai Cârciog, and the first issue was published on 22 June 1992.Media Index. Evenimentul Zilei Euro Topics. Retrieved 6 December 2013 The newspaper reached its peak daily circulation of 675,000 in 1993. In 1997 chief editor Ion Cristoiu quit and this job was taken by Cornel Nistorescu. The newspaper was purchased along with its parent company Publishing in 1998 by the German company (owned, in turn, by [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hotel Lido
A hotel is an establishment that provides paid lodging on a short-term basis. Facilities provided inside a hotel room may range from a modest-quality mattress in a small room to large suites with bigger, higher-quality beds, a dresser, a refrigerator and other kitchen facilities, upholstered chairs, a flat screen television, and en-suite bathrooms. Small, lower-priced hotels may offer only the most basic guest services and facilities. Larger, higher-priced hotels may provide additional guest facilities such as a swimming pool, business centre (with computers, printers, and other office equipment), childcare, conference and event facilities, tennis or basketball courts, gymnasium, restaurants, day spa, and social function services. Hotel rooms are usually numbered (or named in some smaller hotels and B&Bs) to allow guests to identify their room. Some boutique, high-end hotels have custom decorated rooms. Some hotels offer meals as part of a room and board arrangement. In Jap ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
