Geodesic
The stability radius of an operator of Saphar type
Studia Mathematica, Tome 113 (1995) no. 2, pp. 169-175

Voir la notice de l'article provenant de la source Institute of Mathematics Polish Academy of Sciences

A bounded linear operator T on a complex Banach space X is called an operator of Saphar type if its kernel is contained in its generalized range $⋂_{n=1}^{∞} T^n(X)$ and T is relatively regular. For T of Saphar type we determine the supremum of all positive numbers δ such that T - λI is of Saphar type for |λ| δ.
DOI : 10.4064/sm-113-2-169-175

Christoph Schmoeger 1

1 
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Christoph Schmoeger. The stability radius of an operator of Saphar type. Studia Mathematica, Tome 113 (1995) no. 2, pp. 169-175. doi: 10.4064/sm-113-2-169-175

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