References
- B. Aupetit, A primer on spectral theory, Springer-Verlag, New York, 1991.
- R. Brits and H. Raubenheimer, Finite spectra and quasinilpotent equivalence in Banach algebras, Czechoslovak Math. J. 62 (2012), 1101–1116.
- I. Colojoarǎ and C. Foia¸s, Quasinilpotent equivalence of not necessarily commuting operators, J. Math. Mech. 15 (1966), 521–540.
- B.P. Duggal, Asymptotic intertwining by the identity operator and permanence of spectral properties, Banach J. Math. Anal. 7(1) (2013), 186–195.
- B.P. Duggal, I.H. Jeon and I.H. Kim, Upper triangular operator matrices, asymptotic intertwining and Browder, Weyl theorems, J. Inequal. Appl. 2013, 2013:268.
- C. Foiaa¸nd F.-H. Vasilescu, On the spectral theory of commutators, J. Math. Anal. Appl. 31 (1970), 473–486.
- S. Frunzǎ, Jordan operators on Hilbert space, J. Operator Theory 18 (1987), 201–212.
- K.B. Laursen and M.M. Neumann, An introduction to local spectral theory, Oxford University Press, Oxford, 2000.
- B. Ya. Levin, Lectures on entire functions, AMS, Providence, RI, 1996.
- N. Levinson, On a problem of Polya, Amer. J. Math. 58(4) (1936), 791–798.
- T.W. Palmer, Banach algebras and the general theory of ∗-Algebras, Vol. I algebras and Banach algebras, Cambridge University Press, Cambridge, 1994.
- . T. Ransford, Potential theory in the complex plane, LMS Student Texts 28, Cambridge University Press, Cambridge, 1995.
- M. Razpet, The quasinilpotent equivalence in Banach algebras, J. Math. Anal. Appl. 166 (1992), 378–385.
- W. Rudin, Real and complex analysis, McGraw-Hill, New York, 1987.
- W. Rudin, Functional analysis, McGraw-Hill, New York, 1991.
- F.-H. Vasilescu, Analytic functional calculus and spectral decompositions, Editura Academiei and D. Reidel Publishing Company, Bucharest, 1982.
- F.-H. Vasilescu, Some properties of the commutator of two operators, J. Math. Anal. Appl. 23 (1968), 440–446.
- F.-H. Vasilescu, Spectral distance of two operators, Rev. Roumaine Math. Pures Appl. 12 (1967), 733–736.