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Uchenye Zapiski Kazanskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki, 2018, Volume 160, Book 2, Pages 243–249
(Mi uzku1448)
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This article is cited in 1 scientific paper (total in 1 paper)
On an analog of the M. G. Krein theorem for measurable operators
A. M. Bikchentaev Kazan Federal University, Kazan, 420008 Russia
Abstract:
Let ${\mathcal M}$ be a von Neumann algebra of operators on a Hilbert space $\mathcal H$ and $\tau$ be a faithful normal semifinite trace on $\mathcal{M}$. Let $\mu_t(T)$, $t>0$, be a rearrangement of a $\tau$-measurable operator $T$. Let us consider a $\tau$-measurable operator $A$, such that $\mu_t(A)>0$ for all $t>0$ and assume that $\mu_{2t}(A)/\mu_t(A) \to 1$ as $t \to \infty$. Let a $\tau$-compact operator $S$ be so that the operator $I+S$ is right invertible, where $I$ is the unit of ${\mathcal M}$. Then, for a $\tau$-measurable operator $B$, such that $A=B(I+S)$, we have $\mu_{t}(A)/\mu_t(B) \to 1$ as $t \to \infty$. It is an analog of the M.G. Krein theorem (for $\mathcal{M}=\mathcal{B}(\mathcal{H})$ and $\tau =\mathrm{tr}$, theorem 11.4, ch. V [Gohberg I.C., Krein M.G. Introduction to the theory of linear nonselfadjoint operators. In: Translations of Mathematical Monographs. Vol. 18. Providence, R.I., Amer. Math. Soc., 1969. 378 p.] for $\tau$-measurable operators.
Keywords:
Hilbert space, von Neumann algebra, normal trace, $\tau$-measurable operator, distribution function, rearrangement, $\tau$-compact operator.
Received: 12.10.2017
Citation:
A. M. Bikchentaev, “On an analog of the M. G. Krein theorem for measurable operators”, Uchenye Zapiski Kazanskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki, 160, no. 2, Kazan University, Kazan, 2018, 243–249
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https://www.mathnet.ru/eng/uzku1448 https://www.mathnet.ru/eng/uzku/v160/i2/p243
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