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In mathematics, in the area of abstract algebra, a signalizer functor is a mapping from a potential finite subgroup to the centralizers of the nontrivial elements of an abelian group. The signalizer functor theorem provides the conditions under which the source of such a functor is in fact a subgroup.
The signalizer functor was first defined by Daniel Gorenstein.[1] George Glauberman proved the Solvable Signalizer Functor Theorem for solvable groups[2] and Patrick McBride proved it for general groups.[3][4] Results concerning signalizer functors play a major role in the classification of finite simple groups.
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