Geodesic
Linear Difference and Differential Operators with Unbounded Operator Coefficients in Weight Spaces
Matematičeskie zametki, Tome 86 (2009) no. 5, pp. 673-680.

Voir la notice de l'article provenant de la source Math-Net.Ru

We describe the spectrum of linear difference and differential operators with unbounded operator coefficients in weight spaces.
Keywords: linear difference operator, linear differential operator, weight space, complex Banach space, evolution operator, spectrum of an operator, Beurling–Gelfand formula. 
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M. S. Bichegkuev. Linear Difference and Differential Operators with Unbounded Operator Coefficients in Weight Spaces. Matematičeskie zametki, Tome 86 (2009) no. 5, pp. 673-680. http://geodesic.mathdoc.fr/item/MZM_2009_86_5_a3/

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