Then 1 = F.(G)
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Then 1 = F.(G)
Then 1 = F.(G) <F,(G)<F,(G) <..., and this ascending sequence is called the upper nilpotent series (or upper Fitting series) of G. Prove that G is soluble if and only if F.(G)=G for some n. (iii) Suppose that G is soluble. The least integer n for which F.(G)= G is called the nilpotent length (or Fitting height) of G.
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