Geodesic
On Certain Classes of Bounded Linear Operators
Canadian mathematical bulletin, Tome 13 (1970) no. 4, pp. 469-473

Voir la notice de l'article provenant de la source Cambridge University Press

Let T—c be a Fredholm operator, where T is a bounded linear operator on a complex Banach space and c is a scalar, the set of all such scalars is called the Φ-set of T [2] and was studied by many authors. In this connection, the purpose of the present paper is to investigate some classes Φ(V) of all such operators for any subset V of the complex plane.Let X be a Banach space over the field C of complex numbers with dim Z = ∞, unless otherwise stated, B(X) the Banach algebra of all bounded linear operators and K(X) the closed two-sided ideal of all compact operators on X. 
Lin, C-S. On Certain Classes of Bounded Linear Operators. Canadian mathematical bulletin, Tome 13 (1970) no. 4, pp. 469-473. doi: 10.4153/CMB-1970-086-6
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