Defines and studies the essential numerical range We(T) for unbounded Hilbert space operators, showing it captures spectral pollution in projection and truncation approximations.
Absolute and convective instabilities of waves on unbounded and large bounded domains
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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.