We link recently developed approaches to the inverse spectral problem (due to Simon and myself, respectively). We obtain a description of the set of Simon's A functions in terms of a positivity condition. This condition also characterizes the solubility of Simon's fundamental equation.
CITATION STYLE
Remling, C. (2003). Inverse spectral theory for one-dimensional Schrödinger operators: The A function. Mathematische Zeitschrift, 245(3), 597–617. https://doi.org/10.1007/s00209-003-0559-2
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