Continuite lipschitzienne du spectre comme fonction d'un opérateur ...
Abstract; The authors prove that the spectrum of & normal operator on a Hilbert
space, as a set-valued func tion, is lipschitzian in the Hausdorff metric. As an
appli cation, a localization theorem for eigenvalues of normal matrices is given.
Key words: Normal operator, spectrum, continuity of the spectrum. AMS: Primary
47A10 ...
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