For any non-torsion group $G$ with identity $e$, we construct a strongly $G$-graded ring $R$ such that the Jacobson radical $J(R_e)$ is locally nilpotent, but $J(R)$ is not locally nilpotent. This answers a question posed by Puczy{\l}owski.
@article{118698, author = {Andrei V. Kelarev}, title = {On the Jacobson radical of strongly group graded rings}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {35}, year = {1994}, pages = {575-580}, zbl = {0815.16025}, mrnumber = {1307285}, language = {en}, url = {http://dml.mathdoc.fr/item/118698} }
Kelarev, Andrei V. On the Jacobson radical of strongly group graded rings. Commentationes Mathematicae Universitatis Carolinae, Tome 35 (1994) pp. 575-580. http://gdmltest.u-ga.fr/item/118698/
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