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单词 IdealNorm
释义

ideal norm


Let α and β be algebraic integersMathworldPlanetmath in an algebraic number fieldMathworldPlanetmath K and 𝔪 a non-zero ideal in the ring of integers of K.  We say that α and β are congruent modulo the ideal 𝔪 in the case that  α-β𝔪.  This is denoted by

αβ(mod𝔪).

This congruence relationPlanetmathPlanetmath the ring of integers of K into equivalence classesMathworldPlanetmathPlanetmath, which are called the residue classesMathworldPlanetmath modulo the ideal 𝔪.

Definition.  Let K be an algebraic number field and  𝔞  a non-zero ideal in K.  The absolute norm of ideal 𝔞 means the number of all residue classes modulo 𝔞.

Remark.  The of any ideal 𝔞 of K is finite — it has the expression

N(𝔞)=Δ(𝔞)d

where Δ(𝔞) is the discriminantPlanetmathPlanetmathPlanetmath of the ideal and d the fundamental number of the field.

  • N(𝔞𝔟)=N(𝔞)N(𝔟)

  • N(𝔞)=1𝔞=(1)

  • N((α))=|N(α)|

  • N(𝔞)𝔞

  • If N(𝔭) is a rational prime, then 𝔭 is a prime idealMathworldPlanetmathPlanetmathPlanetmath.

Titleideal norm
Canonical nameIdealNorm
Date of creation2013-03-22 15:43:23
Last modified on2013-03-22 15:43:23
Ownerpahio (2872)
Last modified bypahio (2872)
Numerical id17
Authorpahio (2872)
Entry typeDefinition
Classificationmsc 11R04
Synonymnorm of an ideal
Synonymnorm of ideal
Related topicNormAndTraceOfAlgebraicNumber
Related topicCongruencesMathworldPlanetmath
Related topicMultiplicativeCongruence
Related topicBasisOfIdealInAlgebraicNumberField
Related topicIdealClassGroupIsFinite
Related topicRationalIntegersInIdeals
Definescongruence modulo an ideal
Definescongruent modulo the ideal
Definesresidue classes modulo the ideal
Definesabsolute norm of ideal
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更新时间:2025/5/4 19:08:53