Pseudospectra of differential operators

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Large Deviations Asymptotics and the Spectral Theory of Multiplicatively Regular Markov Processes (2005, background): “Note that the eigenvalues of K̂ǫ may be interpreted as a pseudo-spectrum; see [8].”
Non‐Self‐Adjoint Differential Operators (2002, background): “We refer the reader to [22] for details of the surprisingly complicated generalizations of the above results to constant coefficient differential operators of arbitrary order, and to [55] for other related results on constant coefficient differential operators.”