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math.GR2021
A -covering subgroup system of a finite group for some classes of -soluble groups
A-Ming Liu, W. Guo, Inna N. Safonova +1
Let be a class of group and a finite group. Then a set of subgroups of is called a \emph{-covering subgroup system} for the class if $G\in {\…
math.GR2020
On a generalisation of finite -groups
Chi Zhang, Wenbin Guo
Let is some partition of all primes and a finite group. A subgroup of is said to be -subnormal in if there exists a subgroup cha…