ideal norm
Let and be algebraic integers in an algebraic number field
and a non-zero ideal in the ring of integers of . We say that and are congruent modulo the ideal in the case that . This is denoted by
This congruence relation the ring of integers of into equivalence classes
, which are called the residue classes
modulo the ideal .
Definition. Let be an algebraic number field and a non-zero ideal in . The absolute norm of ideal means the number of all residue classes modulo .
Remark. The of any ideal of is finite — it has the expression
where is the discriminant of the ideal and the fundamental number of the field.
- •
- •
- •
- •
- •
If is a rational prime, then is a prime ideal
.
Title | ideal norm |
Canonical name | IdealNorm |
Date of creation | 2013-03-22 15:43:23 |
Last modified on | 2013-03-22 15:43:23 |
Owner | pahio (2872) |
Last modified by | pahio (2872) |
Numerical id | 17 |
Author | pahio (2872) |
Entry type | Definition |
Classification | msc 11R04 |
Synonym | norm of an ideal |
Synonym | norm of ideal |
Related topic | NormAndTraceOfAlgebraicNumber |
Related topic | Congruences![]() |
Related topic | MultiplicativeCongruence |
Related topic | BasisOfIdealInAlgebraicNumberField |
Related topic | IdealClassGroupIsFinite |
Related topic | RationalIntegersInIdeals |
Defines | congruence modulo an ideal |
Defines | congruent modulo the ideal |
Defines | residue classes modulo the ideal |
Defines | absolute norm of ideal |