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1. CMB 1998 (vol 41 pp. 481)

Parmenter, M. M.; Spiegel, E.; Stewart, P. N.
 The periodic radical of group rings and incidence algebras Let $R$ be a ring with $1$ and $P(R)$ the periodic radical of $R$. We obtain necessary and sufficient conditions for $P(\RG) = 0$ when $\RG$ is the group ring of an $\FC$ group $G$ and $R$ is commutative. We also obtain a complete description of $P\bigl(I (X, R)\bigr)$ when $I(X,R)$ is the incidence algebra of a locally finite partially ordered set $X$ and $R$ is commutative. Categories:16S34, 16S99, 16N99
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