Characterizations of derivations on triangular rings: Additive maps derivable at idempotents

Characterizations of derivations on triangular rings: Additive maps derivable at idempotents
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三角环上的推导的表征:可在幂等处导出的加法映射

DOI:
10.1016/j.laa.2009.04.005
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发表时间:
2009-08
影响因子:
1.1
通讯作者:
Hou, Jinchuan
Hou, Jinchuan
中科院分区:
数学3区
文献类型:
--
作者:
An, Runling;Hou, Jinchuan

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设T是一个三角环。称元素Z∈T是T的全可导点,如果每个从T到自身的可导的加法映射δ(即δ(A)B+Aδ(B)=δ(Z),对任意A,B∈T,AB=Z)实际上是导子.在三角环T上,在适当的条件下,证明了T的某些幂等元是全导点。作为应用,我们得到了:对因子von Neumann代数R中的任何非平凡套N,对某个投影P∈N,满足PQ=Q,QP=P的每个非零幂等元Q是R的套子代数AlgN的全可导点.
Let T be a triangular ring. An element Z∈T is said to be a full-derivable point of T if every additive map δ from T into itself derivable at Z (i.e. δ(A)B+Aδ(B)=δ(Z) for every A,B∈T with AB=Z) is in fact a derivation. In this paper, under some mild conditions on triangular ring T, we show that some idempotent elements of T are full-derivable points. As an application, we get that, for any nontrivial nest N in a factor von Neumann algebra R, every nonzero idempotent element Q satisfying PQ=Q, QP=P for some projection P∈N is a full-derivable point of the nest subalgebra AlgN of R.
DOI: 10.1112/s0024610700001642
发表时间: 2001-02
期刊: Journal of the London Mathematical Society
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