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arXiv 0907.1195math.OAmath.FA
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关于可测算子代数中导子的几点注记

Some remarks on derivations in algebras of measurable operators

A. F. Ber, B. de Pagter, F. A. Sukochev

摘要:

本文研究了隶属于冯·诺依曼代数$\mathcal{M}$的(无界)算子代数中的导子。设$\mathcal{% A}$是可测算子、局部可测算子或$τ$ -可测算子代数之一.给出了$I$型冯诺依曼代数$\mathcal{M}$的中心投影的完整刻画,使得$\mathcal{A}$中的每个导子都是内导子.证明了所有局部可测算子的代数$LS(\mathcal{M})$关于真无限vonNeumann代数$\mathcal{M}$的导子在$LS(\mathcal{M})$的中心为零.

英文摘要:

This paper is concerned with derivations in algebras of (unbounded) operators affiliated with a von Neumann algebra $\mathcal{M}$. Let $\mathcal{% A}$ be one of the algebras of measurable operators, locally measurable operators or, $τ$-measurable operators. We present a complete description of von Neumann algebras $\mathcal{M}$ of type $I$ in terms of their central projections such that every derivation in $\mathcal{A}$ is inner. It is also shown that every derivation in the algebra $LS(\mathcal{M})$ of all locally measurable operators with respect to a properly infinite von Neumann algebra $\mathcal{M}$ vanishes on the center of $LS(\mathcal{M})$.

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