On $\mathrm{K}$-${\mathbb{P}}_t$-subnormal subgroups of finite groups and related formations

A. F. Vasil'ev, T. I. Vasil'eva

Let $t$ be a fixed natural number. A subgroup $H$ of a group $G$ will be called $\mathrm{K}$-${\mathbb{P}}_t$-subnormal in $G$ if there exists a chain of subgroups $H = H_{0} \leq…