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arXiv 2001.03881math.RA
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环的局部幂零斜扩张

Locally nilpotent skew extensions of rings

Piotr Grzeszczuk

摘要:

本文将局部幂零微分多项式环的已有结果推广到环的斜扩张上。证明了:若$\mathscr{G}=\{σ_t\}_{t\in T}$是代数$R$的自同构的局部有限族,$\mathscr{D}=\{δ_t\}_{t\in T}$是$R$的斜导子族使得$R$的素根$P$在$\mathscr{D}$下强不变,则由$P$生成的$R\langle T,\mathscr{G},\mathscr{D}\rangle$的理想$P\langle T,\mathscr{G},\mathscr{D}\rangle^*$是局部幂零的.然后,我们将这一结果应用到代数与局部幂零导子。证明了特征$0$域上的任何代数$R$,若有一个带交换核的满射局部幂零导子$d$,且$R$由$\ker d^2$生成,则有一个局部幂零Jacobson根.

英文摘要:

We extend existing results on locally nilpotent differential polynomial rings to skew extensions of rings. We prove that if $\mathscr{G}=\{σ_t\}_{t\in T}$ is a locally finite family of automorphisms of an algebra $R$, $\mathscr{D}=\{δ_t\}_{t\in T}$ is a family of skew derivations of $R$ such that the prime radical $P$ of $R$ is strongly invariant under $\mathscr{D}$, then the ideal $P\langle T,\mathscr{G},\mathscr{D}\rangle^*$ of $R\langle T,\mathscr{G},\mathscr{D}\rangle$, generated by $P$, is locally nilpotent. We then apply this result to algebras with locally nilpotent derivations. We prove that any algebra $R$ over a field of characteristic $0$, having a surjective locally nilpotent derivation $d$ with commutative kernel, and such that $R$ is generated by $\ker d^2$, has a locally nilpotent Jacobson radical.

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