Local Fields (book)
''Corps Locaux'' by JeanPierre Serre, originally published in 1962 and translated into English as ''Local Fields'' by Marvin Jay Greenberg in 1979, is a seminal graduatelevel algebraic number theory text covering local fields, ramification, group cohomology, and local class field theory In mathematics, local class field theory, introduced by Helmut Hasse, is the study of abelian extensions of local fields; here, "local field" means a field which is complete with respect to an absolute value or a discrete valuation with a finite res .... The book's end goal is to present local class field theory from the cohomological point of view. This theory concerns extensions of "local" (i.e., complete for a discrete valuation) fields with finite residue field. Contents #''Part I, Local Fields (Basic Facts)'': Discrete valuation rings, Dedekind domains, and Completion. #''Part II, Ramification'': Discriminant & Different, Ramification Groups, The Norm, and Artin Representation. #''Par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] 

JeanPierre Serre
JeanPierre Serre (; born 15 September 1926) is a French mathematician who has made contributions to algebraic topology, algebraic geometry, and algebraic number theory. He was awarded the Fields Medal in 1954, the Wolf Prize in 2000 and the inaugural Abel Prize in 2003. Biography Personal life Born in Bages, PyrénéesOrientales, France, to pharmacist parents, Serre was educated at the Lycée de Nîmes and then from 1945 to 1948 at the École Normale Supérieure in Paris. He was awarded his doctorate from the Sorbonne in 1951. From 1948 to 1954 he held positions at the Centre National de la Recherche Scientifique in Paris. In 1956 he was elected professor at the Collège de France, a position he held until his retirement in 1994. His wife, Professor Josiane HeulotSerre, was a chemist; she also was the director of the Ecole Normale Supérieure de Jeunes Filles. Their daughter is the former French diplomat, historian and writer Claudine Monteil. The French mathematician ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] 

French Language
French ( or ) is a Romance language of the IndoEuropean family. It descended from the Vulgar Latin of the Roman Empire, as did all Romance languages. French evolved from GalloRomance, the Latin spoken in Gaul, and more specifically in Northern Gaul. Its closest relatives are the other langues d'oïl—languages historically spoken in northern France and in southern Belgium, which French ( Francien) largely supplanted. French was also influenced by native Celtic languages of Northern Roman Gaul like Gallia Belgica and by the ( Germanic) Frankish language of the postRoman Frankish invaders. Today, owing to France's past overseas expansion, there are numerous Frenchbased creole languages, most notably Haitian Creole. A Frenchspeaking person or nation may be referred to as Francophone in both English and French. French is an official language in 29 countries across multiple continents, most of which are members of the '' Organisation internationale de la Franc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] 

English Language
English is a West Germanic language of the IndoEuropean language family, with its earliest forms spoken by the inhabitants of early medieval England. It is named after the Angles, one of the ancient Germanic peoples that migrated to the island of Great Britain. Existing on a dialect continuum with Scots, and then closest related to the Low Saxon and Frisian languages, English is genealogically West Germanic. However, its vocabulary is also distinctively influenced by dialects of France (about 29% of Modern English words) and Latin (also about 29%), plus some grammar and a small amount of core vocabulary influenced by Old Norse (a North Germanic language). Speakers of English are called Anglophones. The earliest forms of English, collectively known as Old English, evolved from a group of West Germanic (Ingvaeonic) dialects brought to Great Britain by AngloSaxon settlers in the 5th century and further mutated by Norsespeaking Viking settlers starting in the 8th and 9 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] 

Algebraic Number Theory
Algebraic number theory is a branch of number theory that uses the techniques of abstract algebra to study the integers, rational numbers, and their generalizations. Numbertheoretic questions are expressed in terms of properties of algebraic objects such as algebraic number fields and their rings of integers, finite fields, and function fields. These properties, such as whether a ring admits unique factorization, the behavior of ideals, and the Galois groups of fields, can resolve questions of primary importance in number theory, like the existence of solutions to Diophantine equations. History of algebraic number theory Diophantus The beginnings of algebraic number theory can be traced to Diophantine equations, named after the 3rdcentury Alexandrian mathematician, Diophantus, who studied them and developed methods for the solution of some kinds of Diophantine equations. A typical Diophantine problem is to find two integers ''x'' and ''y'' such that their sum, and t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] 

Springer Science+Business Media
Springer Science+Business Media, commonly known as Springer, is a German multinational publishing company of books, ebooks and peerreviewed journals in science, humanities, technical and medical (STM) publishing. Originally founded in 1842 in Berlin, it expanded internationally in the 1960s, and through mergers in the 1990s and a sale to venture capitalists it fused with Wolters Kluwer and eventually became part of Springer Nature in 2015. Springer has major offices in Berlin, Heidelberg, Dordrecht, and New York City. History Julius Springer founded SpringerVerlag in Berlin in 1842 and his son Ferdinand Springer grew it from a small firm of 4 employees into Germany's then second largest academic publisher with 65 staff in 1872.Chronology ". Springer Science+Business Media. In 1964, Springer expanded its business internationally ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] 

Marvin Jay Greenberg
Marvin Jay Greenberg (December 22, 1935 – December 12, 2017) was an American mathematician. Education Greenberg studied at Columbia University where he received his bachelor's degree in 1955 (he was a Ford Scholar as an undergraduate) and received his doctorate 1959 from Princeton University under Serge Lang with the thesis ''ProAlgebraic Structure on the Rational Subgroup of a PAdic Abelian Variety''. Career From 1955 Greenberg was an assistant at Princeton, from 1958 an assistant at the University of Chicago and in 1958 and 1959, an instructor at Rutgers University. From 1959 to 1964 he was an assistant professor at the University of California, Berkeley, two years of which time he spent on National Science Foundation postdoctoral fellowships at Harvard University and the Institut des Hautes Études Scientifiques in Paris. From 1965 to 1967 he was an associate professor at Northeastern University and from 1967 he worked as an associate professor, and later full prof ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] 

Algebraic Number Theory
Algebraic number theory is a branch of number theory that uses the techniques of abstract algebra to study the integers, rational numbers, and their generalizations. Numbertheoretic questions are expressed in terms of properties of algebraic objects such as algebraic number fields and their rings of integers, finite fields, and function fields. These properties, such as whether a ring admits unique factorization, the behavior of ideals, and the Galois groups of fields, can resolve questions of primary importance in number theory, like the existence of solutions to Diophantine equations. History of algebraic number theory Diophantus The beginnings of algebraic number theory can be traced to Diophantine equations, named after the 3rdcentury Alexandrian mathematician, Diophantus, who studied them and developed methods for the solution of some kinds of Diophantine equations. A typical Diophantine problem is to find two integers ''x'' and ''y'' such that their sum, and t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] 

Local Fields
''Corps Locaux'' by JeanPierre Serre, originally published in 1962 and translated into English as ''Local Fields'' by Marvin Jay Greenberg in 1979, is a seminal graduatelevel algebraic number theory text covering local fields, ramification, group cohomology, and local class field theory In mathematics, local class field theory, introduced by Helmut Hasse, is the study of abelian extensions of local fields; here, "local field" means a field which is complete with respect to an absolute value or a discrete valuation with a finite res .... The book's end goal is to present local class field theory from the cohomological point of view. This theory concerns extensions of "local" (i.e., complete for a discrete valuation) fields with finite residue field. Contents #''Part I, Local Fields (Basic Facts)'': Discrete valuation rings, Dedekind domains, and Completion. #''Part II, Ramification'': Discriminant & Different, Ramification Groups, The Norm, and Artin Representation. #''Part ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] 

Ramification (mathematics)
In geometry, ramification is 'branching out', in the way that the square root function, for complex numbers, can be seen to have two ''branches'' differing in sign. The term is also used from the opposite perspective (branches coming together) as when a covering map degenerates at a point of a space, with some collapsing of the fibers of the mapping. In complex analysis In complex analysis, the basic model can be taken as the ''z'' → ''z''''n'' mapping in the complex plane, near ''z'' = 0. This is the standard local picture in Riemann surface theory, of ramification of order ''n''. It occurs for example in the Riemann–Hurwitz formula for the effect of mappings on the genus. See also branch point. In algebraic topology In a covering map the Euler–Poincaré characteristic should multiply by the number of sheets; ramification can therefore be detected by some dropping from that. The ''z'' → ''z''''n'' mapping shows this as a loc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] 

Group Cohomology
In mathematics (more specifically, in homological algebra), group cohomology is a set of mathematical tools used to study groups using cohomology theory, a technique from algebraic topology. Analogous to group representations, group cohomology looks at the group actions of a group ''G'' in an associated ''G''module ''M'' to elucidate the properties of the group. By treating the ''G''module as a kind of topological space with elements of G^n representing ''n'' simplices, topological properties of the space may be computed, such as the set of cohomology groups H^n(G,M). The cohomology groups in turn provide insight into the structure of the group ''G'' and ''G''module ''M'' themselves. Group cohomology plays a role in the investigation of fixed points of a group action in a module or space and the quotient module or space with respect to a group action. Group cohomology is used in the fields of abstract algebra, homological algebra, algebraic topology and algebraic number theory ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] 

Local Class Field Theory
In mathematics, local class field theory, introduced by Helmut Hasse, is the study of abelian extensions of local fields; here, "local field" means a field which is complete with respect to an absolute value or a discrete valuation with a finite residue field: hence every local field is isomorphic (as a topological field) to the real numbers R, the complex numbers C, a finite extension of the ''p''adic numbers Q''p'' (where ''p'' is any prime number), or a finite extension of the field of formal Laurent series F''q''((''T'')) over a finite field F''q''. Approaches to local class field theory Local class field theory gives a description of the Galois group ''G'' of the maximal abelian extension of a local field ''K'' via the reciprocity map which acts from the multiplicative group ''K''×=''K''\. For a finite abelian extension ''L'' of ''K'' the reciprocity map induces an isomorphism of the quotient group ''K''×/''N''(''L''×) of ''K''× by the norm group ''N'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] 

SpringerVerlag
Springer Science+Business Media, commonly known as Springer, is a German multinational publishing company of books, ebooks and peerreviewed journals in science, humanities, technical and medical (STM) publishing. Originally founded in 1842 in Berlin, it expanded internationally in the 1960s, and through mergers in the 1990s and a sale to venture capitalists it fused with Wolters Kluwer and eventually became part of Springer Nature in 2015. Springer has major offices in Berlin, Heidelberg, Dordrecht, and New York City. History Julius Springer founded SpringerVerlag in Berlin in 1842 and his son Ferdinand Springer grew it from a small firm of 4 employees into Germany's then second largest academic publisher with 65 staff in 1872.Chronology ". Springer Science+Business Media. In 1964, Springer expanded its business internationally ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] 