Nil-clean and strongly nil-clean rings

Nil-clean and strongly nil-clean rings
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零洁净环和强零洁净环

DOI:
10.1016/j.jpaa.2015.07.009
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发表时间:
2016-02
影响因子:
0.8
通讯作者:
Zhou, Yiqiang
Zhou, Yiqiang
中科院分区:
数学2区
文献类型:
--
作者:
Kosan, M. Tamer;Wang, Zhou;Zhou, Yiqiang

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环R的元素a是零干净的,如果a= e+ B,其中e2 = e∈ R且B是幂零的,如果进一步e B= B e,则称元素a是强零干净的.环R被称为零干净(nil-clean)(分别地,强零干净)如果它的每个元素是零干净的(分别地,强零清洁)。证明了元素a是强nil-clean当且仅当a是幂等元与可交换单位之和且a-a2是幂零元;环R是强nil-clean当且仅当R/J(R)是布尔环且J(R)是nil,其中J(R)表示R的Jacobson根.详细讨论了Morita上下文、形式矩阵环和群环的强零清洁性。得到了R的理想I具有R/I强nil-clean蕴涵R强nil-clean性质的一个充要条件.最后,针对矩阵环何时是nil-clean的问题,证明了2-素环R上的矩阵环是nil-clean的当且仅当R/J(R)是布尔的且J(R)是nil的,即R是强nil-clean的.
An element a of a ring R is nil-clean if a= e+ b where e 2= e∈ R and b is a nilpotent; if further e b= b e, the element a is called strongly nil-clean. The ring R is called nil-clean (resp., strongly nil-clean) if each of its elements is nil-clean (resp., strongly nil-clean). It is proved that an element a is strongly nil-clean iff a is a sum of an idempotent and a unit that commute and a− a 2 is a nilpotent, and that a ring R is strongly nil-clean iff R/J (R) is boolean and J (R) is nil, where J (R) denotes the Jacobson radical of R. The strong nil-cleanness of Morita contexts, formal matrix rings and group rings is discussed in details. A necessary and sufficient condition is obtained for an ideal I of R to have the property that R/I strongly nil-clean implies R is strongly nil-clean. Finally, responding to the question of when a matrix ring is nil-clean, we prove that the matrix ring over a 2-primal ring R is nil-clean iff R/J (R) is boolean and J (R) is nil, ie, R is strongly nil-clean.
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