Summary
It is proved that the algebra of bounded additive operators on a complex Hilbert space is the smallest algebra (a vector space in which a ring structure is defined on the set of vectors) containing both linear and antilinear bounded operators on the complex Hilbert space. It is proved further that this algebra is normed and involutive.
References
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Sharma, C.S. The algebra of bounded additive operators on a complex Hilbert space. Nuov Cim B 100, 291–295 (1987). https://doi.org/10.1007/BF02722899
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DOI: https://doi.org/10.1007/BF02722899