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- W4300706446 abstract "We answer several open questions and establish new results concerning differential and skew polynomial ring extensions, with emphasis on radicals. In particular, we prove the following results. If $R$ is prime radical and $delta$ is a derivation of $R$, then the differential polynomial ring $R[X;delta]$ is locally nilpotent. This answers an open question posed in by Nielsen and Ziembowski. The nil radical of a differential polynomial ring $R[X;delta]$ takes the form $I[X;delta]$ for some ideal $I$ of $R$, provided that the base field is infinite. This answers an open question posed by Hong, Kim, Lee and Nielsen for algebras over infinite fields. If $R$ is a graded algebra generated in degree $1$ over a field of characteristic zero and $delta$ is a grading preserving derivation on $R$, then the Jacobson radical of $R$ is $delta$-stable. Examples are given to show the necessity of all conditions, thereby proving this result is sharp. Skew polynomial rings with natural grading are locally nilpotent if and only if they are graded locally nilpotent. The power series ring $R[[X;sigma,delta]]$ is well-defined whenever $delta$ is a locally nilpotent $sigma$-derivation; this answers a conjecture by Bergen and Grzeszczuk and opens up the possibility of generalizing many research directions studied thus far only when further restrictions are put on $delta$." @default.
- W4300706446 created "2022-10-04" @default.
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- W4300706446 date "2017-02-26" @default.
- W4300706446 modified "2023-09-27" @default.
- W4300706446 title "On Radicals of Ore Extensions and Related Questions" @default.
- W4300706446 doi "https://doi.org/10.48550/arxiv.1702.08103" @default.
- W4300706446 hasPublicationYear "2017" @default.
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