Fourier and pseudodifferential operators lie at the heart of modern analysis of differential equations. The Fourier transform recasts differential problems into algebraic ones by converting ...
The scientific method consists of a set of hypotheses formed through inductive reasoning based on observations, which are first systematically tested before being iteratively updated. However, testing ...
Journal of Operator Theory, Vol. 64, No. 2 (Fall 2010), pp. 401-416 (16 pages) We investigate the behaviour of the spectrum of selfadjoint operators in Krein spaces under perturbations with uniformly ...
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