Parfeny P. Saworotnow, "A simple characterization of the trace-class of operators", International Journal of Mathematics and Mathematical Sciences, vol. 4, Article ID 934514, 2 pages, 1981. https://doi.org/10.1155/S0161171281000276
A simple characterization of the trace-class of operators
The trace-class of operators on a Hilbert space is characterized in terms of existence of certain centralizers.
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