View source for Descendant subgroup

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{{MSC|20F14}}

A  [[subgroup]] of a [[group]] for which there is a descending series starting from the subgroup and ending at the group,  such that every term in the series is a [[normal subgroup]] of its  predecessor.  The series may be an infinite [[subgroup system]]. If the series is finite, then the subgroup is [[subnormal subgroup|subnormal]]. 

==References==
*  Martyn R. Dixon, "Sylow Theory, Formations, and Fitting Classes", in ''Locally Finite Groups'' (World  Scientific, 1994) {{ISBN|9810217951}}, p.6