Abstract
设G是有限生成无挠幂零群，α是G的4阶自同构且 是满射，则G的二阶导群G'' 包含在G的中心Z(G) 里且CG(α2) 是Abel群。 Let G be a finitely generated torsion-free nilpotent group and α an automorphism of order four of G. If the map G→G defined by is surjective, then the second derived subgroup G'' is included in the centre of G and CG(α2) is abelian.
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