Geodesic
On Meromorphic Operators, II
Canadian journal of mathematics, Tome 19 (1967) no. 1, pp. 737-748

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This paper forms a continuation of (1), extending the concept of a meromorphic operator to not necessarily bounded, closed linear operators in complex Banach space. Let T denote such an operator with range and domain in Banach space X. We shall study the class of such operators T where λ = 0 and λ = ∞ are the only allowable points of accumulation of σ(T) and every isolated point of σ(T) is a pole of Rλ(T). We shall write (0, ∞) to represent the class of such operators. If λ = 0 (λ = ∞) is the only allowable point of accumulation of σ(T), we shall write (0) ((∞)) to denote the corresponding class of operators. 
Caradus, S. R. On Meromorphic Operators, II. Canadian journal of mathematics, Tome 19 (1967) no. 1, pp. 737-748. doi: 10.4153/CJM-1967-067-2
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