De Falco, Maria:
Groups with many nearly normal subgroups
Bollettino dell'Unione Matematica Italiana Serie 8 4-B (2001), fasc. n.2, p. 531-540, Unione Matematica Italiana (English)
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Sunto
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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