Israel Journal of Mathematics

, Volume 117, Issue 1, pp 221–237

Cardinality and nilpotency of localizations of groups andG-modules


DOI: 10.1007/BF02773571

Cite this article as:
Libman, A. Isr. J. Math. (2000) 117: 221. doi:10.1007/BF02773571


We consider the effect of a coagumented idempotent functorJ in the the category of groups orG-modules whereG is a fixed group. We are interested in the ‘extent’ to which such functors change the structure of the objects to which they are applied. Some positive results are obtained and examples are given concerning the cardinality and structure ofJ(A) in terms of the cardinality and structure ofA, where the latter is a torsion abelian group. For non-abelian groups some partial results and examples are given connecting the nilpotency classes and the varieties of a groupG andJ(G). Similar but stronger results are obtained in the category ofG-modules.


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Copyright information

© Hebrew University 2000

Authors and Affiliations

  1. 1.Institute of MathematicsThe Hebrew University of Jerusalem Givat RamJerusalemIsrael

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