- See also
- References
In number theory, a norm group is a group of the form 
where 
is a finite abelian extension of nonarchimedean local fields. One of the main theorems in local class field theory states that the norm groups in 
are precisely the open subgroups of of finite index.
See also
- Takagi existence theorem
References
- J.S. Milne, Class field theory. Version 4.01.
1 : Algebraic number theory
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