The minimal size of a generating set for primitive $\frac{3}{2}$-transitive groups

Abstract

We refer to $d(G)$ as the minimal cardinality of a generating set of a finite group $G$, and say that $G$ is $d$-generated if $d(G)\le d$. A transitive permutation group $G$ is called $\frac{3}{2}$-transitive if a point stabilizer $G_{\alpha }$ is nontrivial and its orbits distinct from $\{\alpha \}$ are of the same size. We prove that $d(G)\le 4$ for every primitive $\frac{3}{2}$-transitive permutation group $G$, moreover, $G$ is $2$-generated except for the very particular solvable affine groups that we completely describe. In particular, all finite $2$-transitive and $2$-homogeneous groups are $2$-generated. We also show that every finite group whose abelian subgroups are cyclic is $2$-generated, and so is every Frobenius complement.

References in corpus (1)

• Sharp upper bounds on the minimal number of elements required to generate a transitive permutation group