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单词 DivisorTheoryInFiniteExtension
释义

divisor theory in finite extension


Theorem.  Let the integral domainMathworldPlanetmath 𝒪, with the quotient field k, have the divisor theory  𝒪*𝔇, determined (see divisors and exponents) by the exponent (http://planetmath.org/ExponentValuation2) system N0 of k.  If K/k is a finite extensionMathworldPlanetmath, then the exponent system N, consisting of the continuations (http://planetmath.org/ContinuationOfExponent) of all exponents in N0 to the field K, determines the divisor theory of the integral closureMathworldPlanetmath of 𝒪 in K.

Corollary.  In the ring of integers 𝒪 of any algebraic number fieldMathworldPlanetmath (ϑ), there is a divisor theory 𝒪*𝔇, determined by the set of all exponent valuations of (ϑ).

References

  • 1 S. Borewicz & I. Safarevic: Zahlentheorie.  Birkhäuser Verlag. Basel und Stuttgart (1966).
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