Publisher's Synopsis
Excerpt from Bounds on Scattering Phase Shifts
Variational techniques have proved invaluable in scattering theory, in the evaluation of phase shifts, for example. They nevertheless suffer from the serious disadvantage, compared to the corresponding variational calculations of binding energies, for instance, that they do not provide a bound on the phase shift. This disadvantage is most pronounced in problems of such difficulty that one cannot guess at a reasonable form for the trial function, though it is precisely for those problems that variational techniques are potentially most valuable.
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