Acknowledgement
Supported by : research fund of Woosuk University
References
- Invertibility and singularity Harte, R.E.
- Proc. Amer. Math. Soc. v.119 Taylor exactness and Kato's jump Harte, R.E.
- J. Operator Theory v.30 The pucntured neighborhood threorem for incomplete spaces Harte, R.E.;Lee, W.Y.
- J. Analyse Math. v.6 Perturbation theory for nullity, deficiency and other quantities of linear operators Kato, T.
- Proc. Roy. Irish Acad. Sect. v.A 87 A Riesz-Schauder theorem for semi-Fredholm operators West, T.T.
- Rocky Mountain J. Math. v.20 Removing the jump-Kato's decomposition West, T.T.