Fredholmness and Weylness of block operator matrices

Autor:	Sarajlija, Nikola
Rok vydání:	2021
Předmět:	Mathematics - Functional Analysis 47A08 47A53 47A55 47A05 47A10
Druh dokumentu:	Working Paper
Popis:	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). Comment: arXiv admin note: text overlap with arXiv:2108.12153
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2108.12425 Zobrazit plný text záznamu View this record from Arxiv