Abstract. Various bounds for perturbation of eigenvalues of normal matrices are shown to remain true for compact perturbations of normal operators, if ``extended'' eigenvalue sets are considered in the sense introduced by T. Kato.

AMS Subject Classification (1991): 47A75, 15A42; 47A55, 47B10

Keyword(s): Spectral variation, Eigenvalue perturbation

Received March 2, 1995 and in revised form July 10, 1998. (Registered under 2684/2009.)