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Huang, Jinghao; Kudaybergenov, Karimbergen; Sukochev, Fedor
Linear algebra and its applications, 09/2023, Volume: 672Journal Article
Let M be a type II1 von Neumann algebra, S(M) be the Murray–von Neumann algebra associated with M and let A be a ⁎-subalgebra in S(M) with M⊆A. We prove that any ring derivation D from A into S(M) is necessarily inner. Further, we prove that if A is an EW⁎-algebra such that its bounded part Ab is a W⁎-algebra without finite type I direct summands, then any ring derivation D from A into LS(Ab) — the algebra of all locally measurable operators affiliated with Ab, is an inner derivation. We also give an example showing that the condition M⊆A is essential. At the end of this paper, we provide several criteria for an abelian extended W⁎-algebra such that all ring derivations on it are linear.
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