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Trace class perturbations of isometries and unitary dilations
1974
Proceedings of the American Mathematical Society
Preserved Fulltext
Let U and V be isometries acting on a Hubert space. If U -V belongs to the trace class we show that the absolutely continuous parts of the corresponding minimal unitary dilations are unitarily equivalent.
doi:10.1090/s0002-9939-1974-0358399-5
fatcat:ac6uxfmfjfc2bg7iqdsvyok44i