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On a theorem of Ismagilov |
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| Authors: | James S Howland Tosio Kato |
| Affiliation: | Department of Mathematics, University of Virginia, Charlottesville, Virginia 22903 U.S.A.;Department of Mathematics, University of California, Berkeley, California 94720 U.S.A. |
| Abstract: | If A and B are bounded selfadjoint operators and AB is trace class, then the absolutely continuous part of A + B is unitarily equivalent to the direct sum of the absolutely continuous parts of A and B. |
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