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Brief communications
Tensor simple spectrum of unitary flows
V. V. Ryzhikov Lomonosov Moscow State University, Faculty of Mechanics and Mathematics
Abstract:
Unitary flows $T_t$ of dynamical origin such that, for any countable
$Q\subset (0,+\infty)$, the spectrum of the tensor product $\bigotimes_{q\in Q} T_q $ is simple are constructed.
All typical flows preserving a sigma-finite measure have this property.
Keywords:
unitary flow, weak closure, spectrum, tensor product of operators.
Received: 04.05.2022 Revised: 14.05.2022 Accepted: 21.05.2022
Citation:
V. V. Ryzhikov, “Tensor simple spectrum of unitary flows”, Funktsional. Anal. i Prilozhen., 56:4 (2022), 113–117; Funct. Anal. Appl., 56:4 (2022), 327–330
Linking options:
https://www.mathnet.ru/eng/faa4011https://doi.org/10.4213/faa4011 https://www.mathnet.ru/eng/faa/v56/i4/p113
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Abstract page: | 160 | Full-text PDF : | 23 | References: | 62 | First page: | 13 |
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