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The converse of Baer's theorem for two-nilpotent variety | ||
| Caspian Journal of Mathematical Sciences | ||
| دوره 12، شماره 2 - شماره پیاپی 24، 2023، صفحه 341-351 اصل مقاله (133.74 K) | ||
| نوع مقاله: Research Articles | ||
| شناسه دیجیتال (DOI): 10.22080/cjms.2020.18715.1484 | ||
| نویسندگان | ||
| Fateme Mahdipour* 1؛ Mahboubeh Alizadeh Sanati2 | ||
| 1Department of mathematics, Golestan university, Gorgan, Iran | ||
| 2Department of mathematics, Golestan University, Gorgan, Iran | ||
| تاریخ دریافت: 17 اردیبهشت 1399، تاریخ بازنگری: 22 تیر 1399، تاریخ پذیرش: 28 تیر 1399 | ||
| چکیده | ||
| In this paper the generalization of the converse of Baer's theorem for two-nilpotent variety of class row $(n,m)$. is carried out. Baer proved that finiteness of $G/Z_n(G)$ implies that $\gamma_{n+1}(G)$ is finite. Hekster proved the converse of the Baer's theorem with the assumption that $G$ can be finitely generated. The Baer's theorem can be considered as a result of a classical theorem by Schur denoting that finiteness of $G/Z(G)$ leads to the finiteness of $G'$. The converse of the Baer's theorem has been proved conditionally by Taghavi et al. (2019), as well. In the Main Theorem, we prove that, if $\gamma_{m,n}(G)\cap Z_{n,m}(G)=1$ and $\gamma_{m,n+i}(G)$ is finite for some $n,i,m \geq 0$. Then $G/Z_{n,m}(G)$ is finite. In this article some other results are attained by the converse of the Baer's theorem. It is also concluded that when $n=m=1$. Similar results are obtained for variety of the soluble groups. In addition, the converse of the Schur's theorem which proved by Halasi and Podoski is concluded in this paper, for two-nilpotent variety. We have also obtained some similar results of Chakaneh et al. (2019) for $(n,m)$-isoclinic family of groups and $(1,m)$-stem groups. | ||
| کلیدواژه‌ها | ||
| Baer's theorem؛ Frattini subgroup؛ Two-nilpotent variety؛ Upper and lower central series | ||
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آمار تعداد مشاهده مقاله: 485 تعداد دریافت فایل اصل مقاله: 138 |
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