so that the norm, when considered on non-zero elements, is a group homomorphism from the multiplicative group of L to that of K.
of α, for g in the Galois group G of L/K.
3. The norm of an algebraic element α over K can be defined as the product N(α) of the roots of its minimal polynomial, which are different pairwise since the extension is Galois and so the minimal polynomial is separable. Assuming α is in L, the elements
are those roots, each repeated a certain number d of times. Here
is the degree of L over the subfield M of L that is the splitting field of the minimal polynomial of α. Therefore the relationship of the norms is
NL/K(α) = N(α)d.
In algebraic number theory one defines also norms for ideals. This is done in such a way that if I is an ideal of OK, the ring of integers of the number field K, N(I) is the number of residue classes in OK/I - i.e. the cardinality of this finite ring. Hence this norm of an ideal is always a positive integer. When I is a principal ideal αOK there is the expected relation between N(I) and the absolute value of the norm to Q of α, for α an algebraic integer.
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