Abstract
Following, for example, Kurošs [8], we define the (transfinite) upper central series of a group G to be the seriessuch 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.
Publisher
Cambridge University Press (CUP)
Subject
Applied Mathematics,General Mathematics
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