Abstract
The purpose of this paper is to characterize subnormality of operators composed of unbounded weighted shifts (or even more general, orthogonal sums of such shifts) and their adjoints.
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References
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Stochel, J., Szafraniec, F.H. Unbounded weighted shifts and subnormality. Integr equ oper theory 12, 146–153 (1989). https://doi.org/10.1007/BF01199763
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DOI: https://doi.org/10.1007/BF01199763