Abstract
This paper is devoted to local derivations on subalgebras on the algebra S(M, τ) of all τ-measurable operators affiliated with a von Neumann algebra M without abelian summands and with a faithful normal semi-finite trace τ. We prove that if \({\mathcal{A}}\) is a solid *-subalgebra in S(M, τ) such that \({p \in \mathcal{A}}\) for all projection p ∈ M with finite trace, then every local derivation on the algebra \({\mathcal{A}}\) is a derivation. This result is new even in the case of standard subalgebras on the algebra B(H) of all bounded linear operators on a Hilbert space H. We also apply our main theorem to the algebra S 0(M, τ) of all τ-compact operators affiliated with a semi-finite von Neumann algebra M and with a faithful normal semi-finite trace τ.
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The second named author (K.K.) acknowledges the MOHE grant ERGS13-024-0057 for support, and International Islamic University Malaysia for their kind hospitality.
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Mukhamedov, F., Kudaybergenov, K. Local Derivations on Subalgebras of τ-Measurable Operators with Respect to Semi-finite von Neumann Algebras. Mediterr. J. Math. 12, 1009–1017 (2015). https://doi.org/10.1007/s00009-014-0447-5
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DOI: https://doi.org/10.1007/s00009-014-0447-5