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• W2127619791 abstract "Eigenvalue problems for semidefinite operators with infinite dimensional kernels appear for instance in electromagnetics. Variational discretizations with edge elements have long been analyzed in terms of a discrete compactness property. As an alternative, we show here how the abstract theory can be developed in terms of a geometric property called the vanishing gap condition. This condition is shown to be equivalent to eigenvalue convergence and intermediate between two different discrete variants of Friedrichs estimates. Next we turn to a more practical means of checking these properties. We introduce a notion of compatible operator and show how the previous conditions are equivalent to the existence of such operators with various convergence properties. In particular the vanishing gap condition is shown to be equivalent to the existence of compatible operators satisfying an Aubin-Nitsche estimate. Finally we give examples demonstrating that the implications not shown to be equivalences, indeed are not." @default.
• W2127619791 created "2016-06-24" @default.
• W2127619791 creator A5006596455 @default.
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• W2127619791 date "2012-03-30" @default.
• W2127619791 modified "2023-09-27" @default.
• W2127619791 title "On variational eigenvalue approximation of semidefinite operators" @default.
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• W2127619791 doi "https://doi.org/10.1093/imanum/drs002" @default.
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