Defines and studies the essential numerical range We(T) for unbounded Hilbert space operators, showing it captures spectral pollution in projection and truncation approximations.
Method of orthogonal projections and approximation of the spectrum of a bounded operator
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The essential numerical range for unbounded linear operators
Defines and studies the essential numerical range We(T) for unbounded Hilbert space operators, showing it captures spectral pollution in projection and truncation approximations.