A note on subnormal operators
R. N. Mukherjee (1979)
Matematički Vesnik
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R. N. Mukherjee (1979)
Matematički Vesnik
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Stewart E. Stonehewer (1980)
Rendiconti del Seminario Matematico della Università di Padova
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Carlo Casolo (1992)
Rendiconti del Seminario Matematico della Università di Padova
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Francesco De Giovanni, Alessio Russo (1999)
Rendiconti del Seminario Matematico della Università di Padova
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Howard Smith (1992)
Rendiconti del Seminario Matematico della Università di Padova
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Howard Smith (2011)
Rendiconti del Seminario Matematico della Università di Padova
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Leonid Kurdachenko, Howard Smith (2009)
Open Mathematics
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We introduce the notion of the non-subnormal deviation of a group G. If the deviation is 0 then G satisfies the minimal condition for nonsubnormal subgroups, while if the deviation is at most 1 then G satisfies the so-called weak minimal condition for such subgroups (though the converse does not hold). Here we present some results on groups G that are either soluble or locally nilpotent and that have deviation at most 1. For example, a torsion-free locally nilpotent with deviation at...
Leonid A. Kurdachenko, Howard Smith (2007)
Commentationes Mathematicae Universitatis Carolinae
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A group has subnormal deviation at most if, for every descending chain of non-subnormal subgroups of , for all but finitely many there is no infinite descending chain of non-subnormal subgroups of that contain and are contained in . This property , say, was investigated in a previous paper by the authors, where soluble groups with and locally nilpotent groups with were effectively classified. The present article affirms a conjecture from that article by showing that...