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    Fundamental Theorem of Galois Theory

    Definition

    For a Galois extension field K of a field F, the fundamental theorem of Galois theory states that the subgroups of the Galois group G = Gal(K/F) correspond with the subfields of K containing F. If the subfield L corresponds to the subgroup H, then the extension field degree of K over L is the group order of H, left bracketing bar K:L right bracketing bar | = | left bracketing bar H right bracketing bar left bracketing bar L:F right bracketing bar | = | left bracketing bar G:H right bracketing bar .

    Related term

    field automorphism

    Associated person

    Évariste Galois

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