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Abstract Wirtinger and Northcott introduced an inequality bounding the norm of a 2π periodic function by the norm of its derivatives. It is shown here that this type of result occurs for other operators, defined on various domains and spaces. 2000 Mathematics Subject Classification 26D10 (primary); 41A17 (secondary). © London Mathematical Society
Bulletin of the London Mathematical Society – Oxford University Press
Published: Jul 1, 2003
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