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Published online by Cambridge University Press: 20 November 2018
This paper is concerned with the Kirillov map for a class of torsion-free nilpotent groups $G$.
$G$ is assumed to be discrete, countable and
$\pi $-radicable, with
$\pi $ containing the primes less than or equal to the nilpotence class of
$G$. In addition, it is assumed that all of the characters of
$G$ have idempotent absolute value. Such groups are shown to be plentiful.