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profinite completion

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  • Class formation — In mathematics, a class formation is a structure used to organize the various Galois groups and modules that appear in class field theory. They were invented by Emil Artin and John Tate. Contents 1 Definitions 2 Examples of class formations 3 The …   Wikipedia

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  • Class field theory — In mathematics, class field theory is a major branch of algebraic number theory that studies abelian extensions of number fields. Most of the central results in this area were proved in the period between 1900 and 1950. The theory takes its name… …   Wikipedia

  • Adele ring — In number theory, the adele ring is a topological ring which is built on the field of rational numbers (or, more generally, any algebraic number field). It involves all the completions of the field.The word adele is short for additive idele .… …   Wikipedia

  • Duality (mathematics) — In mathematics, a duality, generally speaking, translates concepts, theorems or mathematical structures into other concepts, theorems or structures, in a one to one fashion, often (but not always) by means of an involution operation: if the dual… …   Wikipedia

  • Étale fundamental group — The étale fundamental group is an analogue in algebraic geometry, for schemes, of the usual fundamental group of topological spaces.Topological analogueIn algebraic topology, the fundamental group :pi 1(T) of a connected topological space T is… …   Wikipedia

  • Quasi-finite field — In mathematics, a quasi finite field is a generalisation of a finite field. Standard local class field theory usually deals with complete fields whose residue field is finite , but the theory applies equally well when the residue field is only… …   Wikipedia

  • Grothendieck's Galois theory — In mathematics, Grothendieck s Galois theory is a highly abstract approach to the Galois theory of fields, developed around 1960 to provide a way to study the fundamental group of algebraic topology in the setting of algebraic geometry. It… …   Wikipedia

  • Residual property (mathematics) — In the mathematical field of group theory, a group is residually X (where X is some property of groups) if it can be recovered from groups with property X .Formally, a group G is residually X if for every non trivial element g there is a… …   Wikipedia

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