Abstract
A result (Lemma 1) is obtained concerning the absolute continuity properties of operators implementing the unitary equivalence of two self-adjoint operators having a positive difference. A proof of the F. and M. Riesz theorem is given as a consequence.
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This work was supported by a National Science Foundation research grant.
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Putnam, C.R. The F. and M. Riesz theorem revisited. Integr equ oper theory 3, 508–514 (1980). https://doi.org/10.1007/BF01702313
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DOI: https://doi.org/10.1007/BF01702313