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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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