Operators with resolvent of bounded characteristic |
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Authors: | Aharon Atzmon |
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Institution: | (1) Department of Mathematics, Technion — Israel Institute of Technology, 32000 Haifa, Israel |
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Abstract: | It is proved that if T is a bounded linear operator on a complex Banach space such that the sequence of norms { Tn , n = 1,2, } is of power growth, then the resolvent of T is of bounded characteristic on the open unit disc D in the complex plane, if and only if T is annihilated by a nonzero holomorphic function on D with infinitely differentiable boundary values. This is analogous to the known result that an operator on a complex Banach space has rational resolvent, if and only if it is annihilated by a nonzero polynomial. |
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