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Von Neumann's inequality for commuting w...
Hartz, Michael...
Von Neumann's inequality for commuting weighted shifts by Hartz, Michael ( Author )
N.A
06-08-2015
We show that every multivariable contractive weighted shift dilates to a tuple of commuting unitaries, and hence satisfies von Neumann's inequality. This answers a question of Lubin and Shields. We also exhibit a closely related $3$-tuple of commuting contractions, similar to Parrott's example, which does not dilate to a $3$-tuple of commuting unitaries.
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Article
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English
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MYR 0.00
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https://arxiv.org/abs/1508.01260
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