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Published online by Cambridge University Press: 02 November 2016
A special atom (respectively, supernilpotent atom) is a minimal element of the lattice
$\mathbb{S}$
of all special radicals (respectively, a minimal element of the lattice
$\mathbb{K}$
of all supernilpotent radicals). A semiprime ring
$R$
is called prime essential if every nonzero prime ideal of
$R$
has a nonzero intersection with each nonzero two-sided ideal of
$R$
. We construct a prime essential ring
$R$
such that the smallest supernilpotent radical containing
$R$
is not a supernilpotent atom but where the smallest special radical containing
$R$
is a special atom. This answers a question put by Puczylowski and Roszkowska.