Remarks on the Upper Centralc Series of a Group | Glasgow Mathematical Journal | Cambridge Core
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Following, for example, Kurošs [8], we define the (transfinite) upper central series of a group G to be the series
such that Zα + 1/Za is the centre of G/Zα, and if β is a limit ordinal, then 
If α is the least ordinal for which Zα =Zα+1=…, then we say that the upper central series has length α, and that Zα= His the hypercentre of G. As usual, we call G nilpotent if Zn= Gfor some finite n.
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Copyright © Glasgow Mathematical Journal Trust 1956
References
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