Proceedings of the American Mathematical Society, Vol. 91, No. 3 (Jul., 1984), pp. 426-432 (7 pages) This paper describes the spectrum and the upper and lower Fredholm spectra of (n + m)-tuples (F(A1) ...

Linear operators form the cornerstone of analysis in Banach spaces, offering a framework in which one can rigorously study continuity, spectral properties and stability. Banach space theory, with its ...

Linear operators form the backbone of modern mathematical analysis and have become indispensable in characterising the behaviour of dynamical systems. At their core, these operators are functions that ...