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首页> 外文期刊>Linear & Multilinear Algebra: An International Journal Publishing Articles, Reviews and Problems >Strong commutativity and Engel condition preserving maps in prime and semiprime rings
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Strong commutativity and Engel condition preserving maps in prime and semiprime rings

机译:素环和半素环中的强可交换性和Engel条件保持图

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Let ? be a prime ring of characteristic different from 2, U{script} its right Ututmi quotient ring, C{script} its extended centroid, f(x _1,., x _n) a multilinear polynomial in n non-commuting variables over C{script} and S = { f(r _1,., r _n): r _1,., r _n ∈ ?}. Let F: ? → ? and G: ? → ? be non-zero generalized derivations on ?. We say that F and G are mutually strong Engel condition preserving (SEP for brevity) on S{script} if [G(x), F(y)]h = [x, y]h, for all x, y ∈ S{script} and fixed h ≥ 1. In this article we show that, if f(x _1,., x _n) is not central valued on ? and F, G are mutually SEP on S{script}, then one of the following holds: (a) there exists λ ∈ C{script} such that, for any x ∈ ?, G(x) = λx and F(x) = λ~(-h) x; (b) char(R) = p ≥ 3 and there exist λ ∈ C{script} and s ≥ 1 such that, for any x ∈ ?, G(x) = λx and is central valued on ?; (c) ? satisfies s _4, the standard identity of degree 4. The semiprime case for mutually SEP derivations on Lie ideals is also considered.
机译:让?是特性不同于2的素环,U {script}是其右Ututmi商环,C {script}是其扩展的质心f(x _1,。,x _n)是C {脚本}和S = {f(r _1,。,r _n):r _1,。,r _n∈?}。让F :? →?和G: →?是?的非零广义导数。我们说,如果[G(x),F(y)] h = [x,y] h,则对于所有x,y∈S,F和G都是S {script}上的互强恩格尔条件保持性(为简洁起见为SEP) {script}并且固定h≥1。在本文中,我们证明,如果f(x _1,。,x _n)不是?的中心值。和F,G在S {script}上互为SEP,则下列条件之一成立:(a)存在λ∈C {script}使得对于任何x∈?,G(x)=λx和F(x )=λ〜(-h)x; (b)char(R)= p≥3并且存在λ∈C {script}和s≥1使得对于任何x∈α,G(x)=λx并在α上为中心值; (C) ?满足s _4,即度4的标准标识。还考虑了基于李理想的SEP相互推导的半素数情况。

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