[1] Benharrat, M., Messirdi, B.: Strong metrizability for closed operators and the semi-Fredholm operators between two Hilbert spaces. Int. J. Anal. Appl. 8 (2015), 110-122.
[2] Cordes, H. O., Labrousse, J. P.:
The invariance of the index in the metric space of closed operators. J. Math. Mech. 12 (1963), 693-719.
MR 0162142 |
Zbl 0148.12402
[3] Gilfeather, F.:
Norm conditions on resolvents of similarities of Hilbert space operators and applications to direct sums and integrals of operators. Proc. Am. Math. Soc. 68 (1978), 44-48.
DOI 10.2307/2040905 |
MR 0475583 |
Zbl 0381.47003
[7] Labrousse, J. P.:
On a metric space of closed operators on a Hilbert space. Univ. Nac. Tucumán, Rev., Ser. A 16 (1966), 45-77.
MR 0226445 |
Zbl 0154.15803
[8] Labrousse, J. P.: Quelques topologies sur des espaces d'opérateurs dans des espaces de Hilbert et leurs applications. Faculté des Sciences de Nice (Math.) 1 (1970), 47 pages.
[10] Singh, R. K., Manhas, J. S.:
Composition Operators on Function Spaces. North-Holland Mathematics Studies 179. North-Holland, Amsterdam (1993).
MR 1246562 |
Zbl 0788.47021