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Quasi-Compact Perturbations of the Weyl Essential Spectrum and Application to Singular Transport Operators

open access: yesInternational Journal of Analysis and Applications, 2015
This paper is devoted to the investigation of the stability of the Weyl essential spectrum of closed densely dened linear operator A subjected to additive perturbation K such that (lambda-A-K)^{-1}K or K(lambda-A-K)^{-1} is a quasi-compact operator ...
Leila Mebarki   +2 more
doaj  

E-assessment in pure mathematics [PDF]

open access: green, 2019
Stefanie Zegowitz
openalex  

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