@Article{JMS-56-340,
author = {Lu , JiakuanKuang , MeiqunWu , Kaixun and Zhang , Boru},
title = {Finite Groups and the Sum of Orders of Their Subgroups},
journal = {Journal of Mathematical Study},
year = {2023},
volume = {56},
number = {4},
pages = {340--344},
abstract = {<p style="text-align: justify;">Let $G$ be a finite group and $σ_1(G) = \frac{1}{|G|} ∑_{H≤G} |H|.$ In this paper, we prove
that if $G$ is a nonsolvable group and $σ_1(G)=\frac{117}{ 20},$ then $G= A_5.$</p>},
issn = {2617-8702},
doi = {https://doi.org/10.4208/jms.v56n4.23.02},
url = {http://global-sci.org/intro/article_detail/jms/22253.html}
}