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** Krull topology
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Krull and topology
The significance of an extension being Galois is that it obeys the fundamental theorem of Galois theory: the closed ( with respect to the Krull topology below ) subgroups of the Galois group correspond to the intermediate fields of the field extension.
If E / F is a Galois extension, then Gal ( E / F ) can be given a topology, called the Krull topology, that makes it into a profinite group.
It follows readily from the definition of the spectrum of a ring, the space of prime ideals of equipped with the Zariski topology, that the Krull dimension of is precisely equal to the irreducible dimension of its spectrum.
In the 1930s, Wolfgang Krull turned things around and took a radical step: start with any commutative ring, consider the set of its prime ideals, turn it into a topological space by introducing the Zariski topology, and study the algebraic geometry of these quite general objects.
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