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Grant General Conditions. Asymptotic lower bounds for the frequencies of certain polygonal membranes , Pac. Millot, and M. Keller, J. Suomalainen Tiedeakatemia. Error rating book. This item will ship to Germany , but the seller has not specified shipping options.
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One way to measure its "abnormality" is to take the operator norm of its self-commutator. The self-commutator vanishes for normal operators. This can be calculated exactly for the disk, but can be difficult for multiplication operators on other domains.
Putnam's inequality gives a sharp estimate that implies an upper bound in this setting. Khavinson proved a lower bound for the norm of the self-commutator of Toeplitz operators acting on the Smirnov space of a domain. We proved a lower bound in terms of the so-called "torsional rigidity", a domain constant from elasticity theory. Report item - opens in a new window or tab. Seller assumes all responsibility for this listing.
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