Abstract
We improve the result of C. C. Huang about self-dual subnormal operators, and consider the converse of this result.
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References
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Saito, I. On self-dual subnormal operators. Integr equ oper theory 15, 864–878 (1992). https://doi.org/10.1007/BF01200705
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DOI: https://doi.org/10.1007/BF01200705