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Measures on orthoideals and L1-spaces associated with positive operators


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Abstract

We study measures on orthoideals in the set of projections in von Neumann algebra, which appear within a framework of L1-spaces associated with positive operators in the algebra. We show that there exists a positive measure on orthoideal, which cannot be extended to a normal weight on the algebra, but can be represented as a difference of two positive measures extendable to normal weights.

About the authors

An. An. Novikov

N.I. Lobachevskii Institute of Mathematics and Mechanics

Author for correspondence.
Email: A.Hobukob@gmail.com
Russian Federation, Kremlevskaya ul. 18, Kazan, Tatarstan, 420008

O. E. Tikhonov

Federal University

Email: A.Hobukob@gmail.com
Russian Federation, Kremlevskaya ul. 18, Kazan, Tatarstan, 420008

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