Summary
Gεe, i. e.G has propertye. Gεe 2, i. e.G is an extension of ane-group by ane-group. Clearly,Gεe 2 does not implyGεe. “Mostly” one can show, that ifGεe 2 butG∉e, theG contains self-normalizinge-subgroups. Hence, in order to concludeGεe ifGεe 2, one will have to impose conditions on the self-normalizinge-subgroups ofG.
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Literature
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Simon, H. Normalizer conditions and group-theoretical properties. Rend. Circ. Mat. Palermo 20, 163–170 (1971). https://doi.org/10.1007/BF02844170
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DOI: https://doi.org/10.1007/BF02844170