Infante-Webb Spectrum of Nonlinear 3 × 3 Upper Triangular Block Operator Matrices

Abstract

The paper examines the Infante-Webb spectrum within the frame- work of nonlinear block operator matrices, focusing on the relationship between the spectra of 3 × 3 matrices and their constituent components. The focus of the study is on the Infante-Webb spectrum of 3×3 nonlinear block operator matrices. This study establishes the connection between the Infante-Webb spectrum of spe- cific 3 × 3 nonlinear block operator matrices and the spectrum of their individual entries.