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Albrecht Böttcher
Albrecht Böttcher (born 29 December 1954) is a German mathematician. His field of research is functional analysis. History Böttcher was born in Oberwiesenthal, Saxony, GDR. Between 1971 and 1973, he was in an elite class for mathematics at the Chemnitz University of Technology. In 1973, he won a silver medal at the 15th International Math Olympiad in Moscow. Böttcher studied mathematics from 1975 to 1979 in Chemnitz and then went to Rostov on Don in 1980 to study and earned a PhD there in 1984. After completing his dissertation, ''The finite section method for the Wiener-Hopf integral operator,'' he worked as scientist assistance at the university of Chemnitz. Since 1992, the professor for ''Harmonic Analysis and Operator theory'' at the Chemnitz University of Technology. Since 2020 he is professor emeritus. , he is the author of nine books and about 180 papers. Selected books * * * * See also * Pseudospectrum In mathematics, the pseudospectrum of an operator is a set containi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Functional Analysis
Functional analysis is a branch of mathematical analysis, the core of which is formed by the study of vector spaces endowed with some kind of limit-related structure (for example, Inner product space#Definition, inner product, Norm (mathematics)#Definition, norm, or Topological space#Definitions, topology) and the linear transformation, linear functions defined on these spaces and suitably respecting these structures. The historical roots of functional analysis lie in the study of function space, spaces of functions and the formulation of properties of transformations of functions such as the Fourier transform as transformations defining, for example, continuous function, continuous or unitary operator, unitary operators between function spaces. This point of view turned out to be particularly useful for the study of differential equations, differential and integral equations. The usage of the word ''functional (mathematics), functional'' as a noun goes back to the calculus of v ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oberwiesenthal
Oberwiesenthal (; officially Kurort Oberwiesenthal) is a town and a ski resort in the district of Erzgebirgskreis in Saxony in Germany. It is situated in the Ore Mountains, on the border with the Czech Republic, 19 km south of Annaberg-Buchholz, and 23 km northeast of Karlovy Vary. At , it is the highest town in Germany.Official web site (in German) The Winter Olympic Games, Olympic and FIS Nordic World Ski Championships, World Championships goldmedalist in ski jumping Jens Weißflog competed for SC Tractor Oberwiesenthal and Oberwiesenthaler SV. Geography Oberwiesenthal lies in the county of Erzgebirgskreis, on the border with the Czech Republic that follows the course of the Pöhlbach stream as far as Bärenstein (Ore Mountains), Bärenstein (10 km northeast). The highest elevation in the borough is ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemnitz University Of Technology
Chemnitz University of Technology () is a public university in Chemnitz, Germany. With around 8,300 students, it is the third largest university in Saxony. It was founded in 1836 as ''Königliche Gewerbschule'' (Royal Mercantile College) and was elevated to a ''Technische Hochschule'', a university of technology, in 1963. With approximately 2,400 employees in science, engineering and management, Chemnitz University of Technology is among the most important employers in the region. History Foundation The tradition of science in this region goes back to the 16th century when Georg Agricola (1494–1555), a famous German scholar of minerals, served as the city's mayor. Historically, the university emerged from the ''Gewerbschule'' (trade school) founded in 1836. One year later, a ''Baugewerkenschule'' (school for the building trades) became affiliated with the ''Königliche Gewerbschule'' (Royal Trade School), which was followed by a ''Königliche Werkmeisterschule'' (Royal Sc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Math Olympiad
The International Mathematical Olympiad (IMO) is a mathematical olympiad for Student competition, pre-university students, and is the oldest of the International Science Olympiads. It is widely regarded as the most prestigious mathematical competition in the world. The first IMO was held in Romania in 1959. It has since been held annually, except in 1980. More than 100 countries participate. Each country sends a team of up to six students, plus one team leader, one deputy leader, and observers. Awards are given to approximately the top-scoring 50% of the individual contestants. Teams are not officially recognized—all scores are given only to individual contestants, but team scoring is unofficially compared more than individual scores. Question type The content ranges from extremely difficult algebra and pre-calculus problems to problems in branches of mathematics not conventionally covered in secondary or high school and often not at university level either, such as Projective ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemnitz
Chemnitz (; from 1953 to 1990: Karl-Marx-Stadt (); ; ) is the third-largest city in the Germany, German States of Germany, state of Saxony after Leipzig and Dresden, and the fourth-largest city in the area of former East Germany after (East Berlin, East) Berlin, Leipzig, and Dresden. The city lies in the middle of a string of cities sitting in the densely populated northern Ore Mountain Foreland, foreland of the Elster Mountains, Elster and Ore Mountains, stretching from Plauen in the southwest via Zwickau, Chemnitz and Freiberg to Dresden in the northeast, and is part of the Central German Metropolitan Region. Located in the Ore Mountain Basin, the city is surrounded by the Ore Mountains to the south and the Central Saxon Hills, Central Saxon Hill Country to the north. The city stands on the Chemnitz River, which is formed through the confluence of the rivers Zwönitz (river), Zwönitz and Würschnitz in the borough of Altchemnitz. The name of the city as well as the names o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rostov On Don
Rostov-on-Don is a port city and the administrative centre of Rostov Oblast and the Southern Federal District of Russia. It lies in the southeastern part of the East European Plain on the Don River, from the Sea of Azov, directly north of the North Caucasus. The southwestern suburbs of the city lie above the Don river delta. Rostov-on-Don has a population of over one million people and is an important cultural, educational, economic and logistical centre of Southern Russia. History Early history From ancient times, the area around the mouth of the Don River has held cultural and commercial importance. Ancient indigenous inhabitants included the Scythian and Sarmatian tribes. It was the site of Tanais, an ancient Greek colony, Fort Tana under the Genoese, and Fort Azak in the time of the Ottoman Empire. In 1749, a custom house was established on the Temernik River, a tributary of the Don, by edict of the Empress Elizabeth, the daughter of Peter the Great, in order to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudospectrum
In mathematics, the pseudospectrum of an operator is a set containing the spectrum of the operator and the numbers that are "almost" eigenvalues. Knowledge of the pseudospectrum can be particularly useful for understanding non-normal operators and their eigenfunctions. The ε-pseudospectrum of a matrix ''A'' consists of all eigenvalues of matrices which are ε-close to ''A'': :\Lambda_\epsilon(A) = \. Numerical algorithms which calculate the eigenvalues of a matrix give only approximate results due to rounding and other errors. These errors can be described with the matrix ''E''. More generally, for Banach space In mathematics, more specifically in functional analysis, a Banach space (, ) is a complete normed vector space. Thus, a Banach space is a vector space with a metric that allows the computation of vector length and distance between vectors and ...s X,Y and operators A: X \to Y , one can define the \epsilon-pseudospectrum of A (typically denoted b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1954 Births
Events January * January 3 – The Italian broadcaster RAI officially begins transmitting. * January 7 – Georgetown–IBM experiment: The first public demonstration of a machine translation system is held in New York, at the head office of IBM. * January 10 – BOAC Flight 781, a de Havilland Comet jet plane, disintegrates in mid-air due to metal fatigue, and crashes in the Mediterranean near Elba; all 35 people on board are killed. * January 12 – 1954 Blons avalanches, Avalanches in Austria kill more than 200. * January 15 – Mau Mau rebellion, Mau Mau leader Waruhiu Itote is captured in Kenya. * January 17 – In Socialist Federal Republic of Yugoslavia, Yugoslavia, Milovan Đilas, one of the leading members of the League of Communists of Yugoslavia, is relieved of his duties. * January 20 – The US-based National Negro Network is established, with 46 member radio stations. * January 21 – The first nuclear-powered submarine, the , is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Living People
Purpose: Because living persons may suffer personal harm from inappropriate information, we should watch their articles carefully. By adding an article to this category, it marks them with a notice about sources whenever someone tries to edit them, to remind them of WP:BLP (biographies of living persons) policy that these articles must maintain a neutral point of view, maintain factual accuracy, and be properly sourced. Recent changes to these articles are listed on Special:RecentChangesLinked/Living people. Organization: This category should not be sub-categorized. Entries are generally sorted by family name In many societies, a surname, family name, or last name is the mostly hereditary portion of one's personal name that indicates one's family. It is typically combined with a given name to form the full name of a person, although several give .... Maintenance: Individuals of advanced age (over 90), for whom there has been no new documentation in the last ten ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
People From Oberwiesenthal
The term "the people" refers to the public or common mass of people of a polity. As such it is a concept of human rights law, international law as well as constitutional law, particularly used for claims of popular sovereignty. In contrast, a people is any plurality of persons considered as a whole. Used in politics and law, the term "a people" refers to the collective or community of an ethnic group or nation. Concepts Legal Chapter One, Article One of the Charter of the United Nations states that "peoples" have the right to self-determination. Though the mere status as peoples and the right to self-determination, as for example in the case of Indigenous peoples (''peoples'', as in all groups of indigenous people, not merely all indigenous persons as in ''indigenous people''), does not automatically provide for independent sovereignty and therefore secession. Indeed, judge Ivor Jennings identified the inherent problems in the right of "peoples" to self-determination, as i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
