Geodesic
Perturbation of the spectrum οf an essentially selfadjoint operator
Applicationes Mathematicae, Tome 22 (1993) no. 1, pp. 75-89
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The aim of this paper is to find estimates of the Hausdorff distance between the spectra of two nonselfadjoint operators. The operators considered are assumed to have their imaginary parts in some normed ideal of compact operators. In the case of the classical Schatten ideals the estimates are given explicitly.
DOI : 10.4064/am-22-1-75-89
Keywords: crossnorm, spectrum 
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Andrzej Pokrzywa. Perturbation of the spectrum οf an essentially selfadjoint operator. Applicationes Mathematicae, Tome 22 (1993) no. 1, pp. 75-89. doi: 10.4064/am-22-1-75-89

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