Abstract
An approximation method, based on a theorem on approximating general operator-valued functions by piecewise-linear ones, is presented and analyzed. Using this method, variational characteristics of the spectrum of a class of operator functions are established.
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Hasanov, M. An Approximation Method in the Variational Theory of the Spectrum of Operator Pencils. Acta Applicandae Mathematicae 71, 117–126 (2002). https://doi.org/10.1023/A:1014545418177
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DOI: https://doi.org/10.1023/A:1014545418177