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Published online by Cambridge University Press: 15 June 2016
Suppose that a finite group G admits an automorphism  of order 2n  such that the fixed-point subgroup
 of order 2n  such that the fixed-point subgroup  of the involution
 of the involution  is nilpotent of class c. Let m =
 is nilpotent of class c. Let m =  ) be the number of fixed points of
) be the number of fixed points of  . It is proved that G has a characteristic soluble subgroup of derived length bounded in terms of n, c whose index is bounded in terms of m, n, c. A similar result is also proved for Lie rings.
. It is proved that G has a characteristic soluble subgroup of derived length bounded in terms of n, c whose index is bounded in terms of m, n, c. A similar result is also proved for Lie rings.