On the conjugate type vector and the structure of a normal subgroup

Chen, Ruifang ; Guo, Lujun

Czechoslovak Mathematical Journal, Tome 72 (2022) no. 1, pp. 201-207

Résumé

Let $N$ be a normal subgroup of a group $G$. The structure of $N$ is given when the $G$-conjugacy class sizes of $N$ is a set of a special kind. In fact, we give the structure of a normal subgroup $N$ under the assumption that the set of $G$-conjugacy class sizes of $N$ is $(p_{1n_1}^{a_{1n_1}},\cdots , p_{1 1}^{a_{11}}, 1) \times \cdots \times (p_{rn_r}^{a_{rn_r}},\cdots , p_{r1}^{a_{r1}}, 1)$, where $r>1$, $n_i>1$ and $p_{ij}$ are distinct primes for $i\in \{1, 2, \cdots , r\}$, $j\in \{1, 2, \cdots , n_i\}$.

Détail

DOI : 10.21136/CMJ.2021.0395-20

Classification : 20D60, 20E45
Keywords: index; conjugacy class size; Baer group