Year: 2024
Type: article
Abstract: ABSTRACT For a closed densely defined linear operator and a bounded linear operator on a Banach space whose essential spectrums are contained in disjoint sectors, we show that the essential spectrum of the associated operator pencil is contained in a sector of the complex plane whose boundaries are determined purely by the angles that define the two sectors, which contain the essential spectrums of and .
Source: PAMM
Authors: Mitsuru Wilson, Hassen Khelif, Carseten Trunk
Institutions: Technische Universität Ilmenau, University of Sfax
Language: English
Subfield: Mathematical Physics
Field: Mathematics
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,090
OpenAlex ID: W4405123380