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Rose Peltesohn
Rose Pauline Peltesohn (16 May 1913 – 21 March 1998) was an Israeli mathematician of German origin. Life Rose Peltesohn was the daughter of the physician Ludwig Peltesohn (1882–1937) and of Cilly Caro. After graduation (Abitur) in March 1931 she studied mathematics and physics at the University of Berlin and got her Ph.D. in Mathematics at 1936 with Issai Schur as supervisor (''Das Turnierproblem für Spiele zu je dreien'', The tournament problem for three person games). Her dissertation was valued ''opus valde laudabile''( de). Being Jewish she emigrated through Italy to Palestine, arriving 1938. Between the years 1939–1942 she worked in a bank and later as a lawyer's secretary and translator in Tel Aviv. She married her cousin Gerhard Peltesohn, a lawyer (1909–1965), and they had two daughters, Ruth (born 1940) and Judith (born 1943). Solution of Heffter's Difference Problems Peltesohn solved the Difference Problems of (1896) in combinatorics in 1939. A Difference Trip ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Kfar Saba
Kfar Saba ( he, כְּפַר סָבָא), officially Kefar Sava, is a city in the Sharon region, of the Central District of Israel. In 2019 it had a population of 110,456, making it the 16th-largest city in Israel. The population of Kfar Saba is nearly entirely Jewish. History of modern Kfar Saba The Palestinian village of Kafr Saba was considered to be ancient Capharsaba – an important settlement during the Second Temple period in ancient Judea,The Origin of the Name Capharsaba Kfar Sava Municipal Council is mentioned for the first time in the writings of , in his account of the attempt of [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Combinatorics
Combinatorics is an area of mathematics primarily concerned with counting, both as a means and an end in obtaining results, and certain properties of finite structures. It is closely related to many other areas of mathematics and has many applications ranging from logic to statistical physics and from evolutionary biology to computer science. Combinatorics is well known for the breadth of the problems it tackles. Combinatorial problems arise in many areas of pure mathematics, notably in algebra, probability theory, topology, and geometry, as well as in its many application areas. Many combinatorial questions have historically been considered in isolation, giving an ''ad hoc'' solution to a problem arising in some mathematical context. In the later twentieth century, however, powerful and general theoretical methods were developed, making combinatorics into an independent branch of mathematics in its own right. One of the oldest and most accessible parts of combinatorics i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Berlin
Berlin is Capital of Germany, the capital and largest city of Germany, both by area and List of cities in Germany by population, by population. Its more than 3.85 million inhabitants make it the European Union's List of cities in the European Union by population within city limits, most populous city, as measured by population within city limits having gained this status after the United Kingdom's, and thus London's, Brexit, departure from the European Union. Simultaneously, the city is one of the states of Germany, and is the List of German states by area, third smallest state in the country in terms of area. Berlin is surrounded by the state of Brandenburg, and Brandenburg's capital Potsdam is nearby. The urban area of Berlin has a population of over 4.5 million and is therefore the most populous urban area in Germany. The Berlin/Brandenburg Metropolitan Region, Berlin-Brandenburg capital region has around 6.2 million inhabitants and is Germany's second-largest metropolitan reg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Tel Aviv
Tel Aviv-Yafo ( he, תֵּל־אָבִיב-יָפוֹ, translit=Tēl-ʾĀvīv-Yāfō ; ar, تَلّ أَبِيب – يَافَا, translit=Tall ʾAbīb-Yāfā, links=no), often referred to as just Tel Aviv, is the most populous city in the Gush Dan metropolitan area of Israel. Located on the Israeli coastal plain, Israeli Mediterranean coastline and with a population of , it is the Economy of Israel, economic and Technology of Israel, technological center of the country. If East Jerusalem is considered part of Israel, Tel Aviv is the country's second most populous city after Jerusalem; if not, Tel Aviv is the most populous city ahead of West Jerusalem. Tel Aviv is governed by the Tel Aviv-Yafo Municipality, headed by Mayor Ron Huldai, and is home to many List of diplomatic missions in Israel, foreign embassies. It is a Global city, beta+ world city and is ranked 57th in the 2022 Global Financial Centres Index. Tel Aviv has the List of cities by GDP, third- or fourth-largest e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Humboldt University
The Humboldt University of Berlin (german: link=no, Humboldt-Universität zu Berlin, abbreviated HU Berlin) is a public research university in the central borough of Mitte in Berlin, Germany. The university was established by Frederick William III on the initiative of Wilhelm von Humboldt, Johann Gottlieb Fichte and Friedrich Daniel Ernst Schleiermacher as the University of Berlin () in 1809, and opened in 1810, making it the oldest of Berlin's four universities. From 1828 until its closure in 1945, it was named Friedrich Wilhelm University (german: link=no, Friedrich-Wilhelms-Universität). During the Cold War, the university found itself in East Berlin and was ''de facto'' split in two when the Free University of Berlin opened in West Berlin. The university received its current name in honour of Alexander and Wilhelm von Humboldt in 1949. The university is divided into nine faculties including its medical school shared with the Freie Universität Berlin. The university h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Issai Schur
Issai Schur (10 January 1875 – 10 January 1941) was a Russian mathematician who worked in Germany for most of his life. He studied at the University of Berlin. He obtained his doctorate in 1901, became lecturer in 1903 and, after a stay at the University of Bonn, professor in 1919. As a student of Ferdinand Georg Frobenius, he worked on group representations (the subject with which he is most closely associated), but also in combinatorics and number theory and even theoretical physics. He is perhaps best known today for his result on the existence of the Schur decomposition and for his work on group representations ( Schur's lemma). Schur published under the name of both I. Schur, and J. Schur, the latter especially in ''Journal für die reine und angewandte Mathematik''. This has led to some confusion. Childhood Issai Schur was born into a Jewish family, the son of the businessman Moses Schur and his wife Golde Schur (née Landau). He was born in Mogilev on the Dnieper Riv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Renate Tobies
Renate A. Tobies (born January 25, 1947) is a German mathematician and historian of mathematics known for her biographies of Felix Klein and Iris Runge. Education and career Tobies grew up in East Germany, and studied mathematics and chemistry at Leipzig University. She completed a doctoral dissertation (Dr. paed.) on the history of chemistry education, ''Die Entwicklung des allgemeinbildenden Chemieunterrichts auf dem Gebiet der DDR unter besonderer Berücksichtigung der ideologischen Erziehung (1945 bis zum VIII. Parteitag der SED)'', there in 1975. After briefly teaching pharmacy, she took a position in Leipzig's Institute for the History of Medicine and Natural Sciences, specializing in the history of mathematics. She completed her habilitation there, and earned a second doctorate (Dr.sc.) in 1986 with a dissertation ''Die gesellschaftliche Stellung deutscher mathematischer Organisationen und ihre Funktion bei der Veränderung der gesellschaftlichen Wirksamkeit der Mathema ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Humboldt-Universität Berlin
The Humboldt University of Berlin (german: link=no, Humboldt-Universität zu Berlin, abbreviated HU Berlin) is a public research university in the central borough of Mitte in Berlin, Germany. The university was established by Frederick William III on the initiative of Wilhelm von Humboldt, Johann Gottlieb Fichte and Friedrich Daniel Ernst Schleiermacher as the University of Berlin () in 1809, and opened in 1810, making it the oldest of Berlin's four universities. From 1828 until its closure in 1945, it was named Friedrich Wilhelm University (german: link=no, Friedrich-Wilhelms-Universität). During the Cold War, the university found itself in East Berlin and was ''de facto'' split in two when the Free University of Berlin opened in West Berlin. The university received its current name in honour of Alexander and Wilhelm von Humboldt in 1949. The university is divided into nine faculties including its medical school shared with the Freie Universität Berlin. The university h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Steiner System
250px, thumbnail, The Fano plane is a Steiner triple system S(2,3,7). The blocks are the 7 lines, each containing 3 points. Every pair of points belongs to a unique line. In combinatorial mathematics, a Steiner system (named after Jakob Steiner) is a type of block design, specifically a t-design with λ = 1 and ''t'' = 2 or (recently) ''t'' ≥ 2. A Steiner system with parameters ''t'', ''k'', ''n'', written S(''t'',''k'',''n''), is an ''n''-element set ''S'' together with a set of ''k''-element subsets of ''S'' (called blocks) with the property that each ''t''-element subset of ''S'' is contained in exactly one block. In an alternate notation for block designs, an S(''t'',''k'',''n'') would be a ''t''-(''n'',''k'',1) design. This definition is relatively new. The classical definition of Steiner systems also required that ''k'' = ''t'' + 1. An S(2,3,''n'') was (and still is) called a ''Steiner triple'' (or ''triad'') ''system'', while an S(3,4,''n'') is called a ''Steiner q ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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1913 Births
Events January * January 5 – First Balkan War: Battle of Lemnos (1913), Battle of Lemnos – Greek admiral Pavlos Kountouriotis forces the Turkish fleet to retreat to its base within the Dardanelles, from which it will not venture for the rest of the war. * January 13 – Edward Carson founds the (first) Ulster Volunteers, Ulster Volunteer Force, by unifying several existing Ulster loyalism, loyalist militias to resist home rule for Ireland. * January 23 – 1913 Ottoman coup d'état: Ismail Enver comes to power. * January – Stalin (whose first article using this name is published this month) travels to Vienna to carry out research. Until he leaves on February 16 the city is home simultaneously to him, Hitler, Trotsky and Josip Broz Tito, Tito alongside Alban Berg, Berg, Freud and Jung and Ludwig Wittgenstein, Ludwig and Paul Wittgenstein. February * February 1 – New York City's Grand Central Terminal, having been rebuilt, reopens as the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |