Fundamental Theorem of Galois
Normal extension of 
Automorphism group of 
with 
as a fixed field
Intermediate field that satisfies 
Subgroup that satisfies 
and 
have the following one-to-one relation:
.In other words, intermediate fields of a normal extension and subgroups of an automorphism group have a one-to-one relation.
An automorphism group is denominated a Galois group.
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