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Ballester-Bolinches, Adolfo; Esteban Romero, Ramón; Lu, Jiakuan | |||
Aquest document és un/a article, creat/da en: 2017 | |||
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The solubility of a finite group with less than 6 non-supersoluble subgroups is confirmed in the paper. Moreover we prove that a finite insoluble group has exactly 6 non-supersoluble subgroups if and only if it is isomorphic to A5 or SL2(5). Furthermore, it is shown that a finite insoluble group has exactly 22 non-nilpotent subgroups if and only if it is isomorphic to A5 or SL2(5). This confirms a conjecture of Zarrin (Arch Math (Basel) 99:201-206, 2012). | |||
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