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Derived length

501 bytes added, 15:15, 11 October 2008
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Given a [[solvable group]], we define its '''solvable length''' as follows: it is the length of the [[derived series]] of the group. Note here that by length of the series, we mean the number of successive inclusions, so the length is one less than the actual number of subgroups in the derived series.
===Relation with nilpotence class===
{{further|[[Nilpotence class versus solvable length]]}}
Any nilpotent group is solvable, and there are numerical relations between the nilpotence class and solvable length:
* [[Solvable length is logarithmically bounded by nilpotence class]]
* [[Solvable length gives no upper bound on nilpotence class]]: For a solvable length greater than <math>1</math>, the value of the solvable length gives no upper bound on the value of the nilpotence class.
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