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International Journal of Mathematics and Mathematical Sciences
Volume 2010, Article ID 190830, 8 pages
Review Article

A Survey on Just-Non- Groups

1Dipartimento di Matematica, Università di Palermo, Via Archirafi 34, 90123, Palermo, Italy
2Dipartimento di Matematica e Applicazioni “R.Caccioppoli”, Università di Napoli “Federico II”, via Cinzia 80126, Napoli, Italy
3Istituto d'Istruzione Secondaria Superiore Statale dell'Isola di Capri Axel Munthe, viale Axel Munthe 4, 80071 Anacapri (Na), Italy

Received 15 December 2009; Accepted 4 February 2010

Academic Editor: Mihai Putinar

Copyright © 2010 Daniele Ettore Otera and Francesco G. Russo. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Let be a class of groups. A group which does not belong to but all of whose proper quotient groups belong to is called just-non- group. The present note is a survey of recent results on the topic with a special attention to topological groups.