On Meromorphic Operators, I
Canadian journal of mathematics, Tome 19 (1967) no. 1, pp. 723-736

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

If X is a complex Banach space and B(X) denotes the space of bounded linear operators on X, then the class of meromorphic operators consists of those T in B(X) such that the non-zero points of σ(T) are poles of the resolvent Rλ(T). If we also require that each non-zero eigenvalue of T have finite multiplicity, members of the class ⊆ so defined have been called operators of Riesz type. and have been studied in (2, 6, 7) and (1,4) respectively.
Caradus, S. R. On Meromorphic Operators, I. Canadian journal of mathematics, Tome 19 (1967) no. 1, pp. 723-736. doi: 10.4153/CJM-1967-066-5
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