Local Fields
《Local Fields》 · 第 172 页 · Chapter XI,Section 4「Abelian Extensions and Norm Groups」,Definition
A subgroup $I$ of $A_E$ is called a norm group if there exists an extension $E'/E$ such that $I=N_{E'/E}(A_{E'})$.
Local Fields
《Local Fields》 · 第 172 页 · Chapter XI,Section 4「Abelian Extensions and Norm Groups」,Definition
A subgroup $I$ of $A_E$ is called a norm group if there exists an extension $E'/E$ such that $I=N_{E'/E}(A_{E'})$.
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