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De Giovanni, F., ‎Imperatore, D. (2014). Groups in which every subgroup has finite index in its Frattini closure. Bulletin of the Iranian Mathematical Society, 40(5), 1213-1226.
F. De Giovanni; D. ‎Imperatore. "Groups in which every subgroup has finite index in its Frattini closure". Bulletin of the Iranian Mathematical Society, 40, 5, 2014, 1213-1226.
De Giovanni, F., ‎Imperatore, D. (2014). 'Groups in which every subgroup has finite index in its Frattini closure', Bulletin of the Iranian Mathematical Society, 40(5), pp. 1213-1226.
De Giovanni, F., ‎Imperatore, D. Groups in which every subgroup has finite index in its Frattini closure. Bulletin of the Iranian Mathematical Society, 2014; 40(5): 1213-1226.

Groups in which every subgroup has finite index in its Frattini closure

Article 11, Volume 40, Issue 5, October 2014, Page 1213-1226  XML PDF (128 K)
Document Type: Research Paper
Authors
F. De Giovanni 1; D. ‎Imperatore2
1Università di Napoli Federico II
2Università di Napoli "Federico II" Dipartimento di Matematica e Applicazioni
Receive Date: 12 July 2013,  Revise Date: 08 September 2013,  Accept Date: 09 September 2013 
Abstract
‎In 1970‎, ‎Menegazzo [Gruppi nei quali ogni sottogruppo e intersezione di sottogruppi massimali‎, ‎ Atti Accad‎. ‎Naz‎. ‎Lincei Rend‎. ‎Cl‎. ‎Sci‎. ‎Fis‎. ‎Mat‎. ‎Natur. 48 (1970)‎, ‎559--562.] gave a complete description of the structure of soluble $IM$-groups‎, ‎i.e.‎, ‎groups in which every subgroup can be obtained as intersection of maximal subgroups‎. ‎A group $G$ is said to have the $FM$-property if every subgroup of $G$ has finite index in the intersection $\hat X$ of all maximal subgroups of $G$ containing $X$‎. ‎The behaviour of (generalized) soluble $FM$-groups is studied in this paper‎. ‎Among other results‎, ‎it is proved that if~$G$ is a (generalized) soluble group for which there exists a positive integer $k$ such that $|\hat X:X|\leq k$ for each subgroup $X$‎, ‎then $G$ is finite-by-$IM$-by-finite‎, ‎i.e.‎, ‎$G$ contains a finite normal subgroup $N$ such that $G/N$ is a finite extension of an $IM$-group‎.
Keywords
Maximal subgroup‎; ‎Frattini closure‎; ‎$FM$-group‎
Main Subjects
20-XX Group theory and generalizations
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