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jackddouglas committed Sep 9, 2024
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# Extension fields
Fundamental concept in abstract algebra, esp field theory. Crucial role in understanding structure of fields and have important applications in areas like algebraic number theory and [[Galois theory]].
Fundamental concept in abstract algebra, esp field theory. Crucial role in understanding structure of fields and have important applications in areas like algebraic number theory and [[Galois Theory|Galois theory]].

## Definition
An extension field is a larger field that contains a given base field as a subfield. If $F$ is the base field and $E$ is the extension field, we denote this as $E/F$ ("E over F").
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