@MISC{Otera10asurvey, author = {Daniele Ettore Otera and Francesco G. Russo}, title = { A Survey on Just-Non-X Groups}, year = {2010} }
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Abstract
Let X be a class of groups. A group which does not belong to X but all of whose proper quotient groups belong to X is called just-non-X group. The present note is a survey of recent results on the topic with a special attention to topological groups.