Finite simple exceptional groups of Lie type in which all subgroups of odd index are pronormal

Abstract

A subgroup H of a group G is said to be pronormal in G if H and H g are conjugate in 〈 H, H g〉 for every g ∈ G. In this paper, we determine the finite simple groups of type E 6 (q) and E 6 2 (q) in which all the subgroups of odd index are pronormal. Thus, we complete a classification of finite simple exceptional groups of Lie type in which all the subgroups of odd index are pronormal. © 2020 Walter de Gruyter GmbH, Berlin/Boston 2020.