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Characteristic subgroup

From Encyclopedia of Mathematics - Reading time: 1 min

A subgroup of a group G that is invariant under all automorphisms of G.


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Examples of characteristic subgroups are the centre of a group, denoted by Z(G), the Fitting subgroup, F(G), the commutator subgroup, D(G), [G,G] or G, the Frattini subgroup, Φ(G), the socle, Socl(G), the layer, E(G), and the generalized Fitting subgroup. For a definition of the last two, cf. Fitting subgroup.


How to Cite This Entry: Characteristic subgroup (Encyclopedia of Mathematics) | Licensed under CC BY-SA 3.0. Source: https://encyclopediaofmath.org/wiki/Characteristic_subgroup
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