Defines and studies the essential numerical range We(T) for unbounded Hilbert space operators, showing it captures spectral pollution in projection and truncation approximations.
On pseudo-spectral problems related to a time-dependent model in supercon- ductivity with electric current
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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.