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单词 AbelianNumberField
释义

abelian number field


Definition 1.

An abelian number field is a number fieldMathworldPlanetmath K such that K/Q is an abelian extensionMathworldPlanetmathPlanetmath, i.e. K/Q is Galois and Gal(K/Q) is an abelian groupMathworldPlanetmath.

The abelian number fields are classified by the Kronecker-Weber TheoremMathworldPlanetmath.

Definition 2.

A cyclic number field is an (abelian) number field K such that K/Q is a Galois extensionMathworldPlanetmath and Gal(K/Q) is a finite cyclic groupMathworldPlanetmath (therefore abelian).

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