On $\sigma$-quasinormal subgroups of finite groups

Bin Hu, Jianhong Huang, Alexander N. Skiba

Let $G$ be a finite group and $\sigma =\{{\sigma }_i|i\in I\}$ some partition of the set of all primes $\mathbb{P}$, that is, $\sigma =\{{\sigma }_i|i\in I\}$, where $\mathbb{P}={\bigcup }_{i\in I}{\sigma }_i$ and…