Fredholmness and Weylness of block operator matrices

Abstract

This paper has aim to characterize Fredholmness and Weylness of upper triangular operator matrices having arbitrary dimension n. We present various characterization results in the setting of infinite dimensional Hilbert spaces, thus extending some known results from Cao X. et al. (2006, 2005) and Zhang et al. (2012) to the case of arbitrary dimension n. We pose our results without using separability assumption, thus improving perturbation results from Wu X. et al. (2020).

arXiv admin note: text overlap with arXiv:2108.12153

Cited by in corpus (2)

• Invertibility properties of operator matrices on Hilbert spaces
• Upper triangular operator matrices and stability of their various spectra