Work

A Note on the Perturbations of Pseudospectra of 2 × 2 Upper-triangular Operator Matrices

Year: 2025

Type: article

Abstract: In this paper we completely describe the sets ∩C2B(Y;X ) σ"(MC) and ∪C2B(Y;X ) σ"(MC). We also analyze the similarities and differences between these results in the case when the spectrum is perturbed.

Source: Facta Universitatis Series Mathematics and Informatics

DOI: 10.22190/fumi250219051k

Author: Marko Kostadinov

Institution: University of Nis

Language: English

Topic: Holomorphic and Operator Theory

Subfield: Applied Mathematics

Field: Mathematics

Domain: Physical Sciences

Open Access status: diamond

OpenAlex ID: W4412519607

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