Geodesic
Groups with many nearly normal subgroups
Bollettino della Unione matematica italiana, Série 8, 4B (2001) no. 2, pp. 531-540.

Voir la notice de l'article provenant de la source Biblioteca Digitale Italiana di Matematica

Un sottogruppo $H$ di un gruppo $G$ si dice nearly normal se ha indice finito nella sua chiusura normale $H^{G}$. In questa nota si caratterizzano i gruppi in cui ogni sottogruppo che non sia nearly normal soddisfa una fissata condizione finitaria $\chi$ per diverse scelte naturali della proprietà $\chi$. 
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     title = {Groups with many nearly normal subgroups},
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De Falco, Maria. Groups with many nearly normal subgroups. Bollettino della Unione matematica italiana, Série 8, 4B (2001) no. 2, pp. 531-540. http://geodesic.mathdoc.fr/item/BUMI_2001_8_4B_2_a13/

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