The Local Asymptotics of Continuum Eigenfunciton Expansions
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Two theses are advanced: (1) The study of spectral invariants can and should be extended to operators with continuous spectra. (2) The subject is closely related to the asymptotic approximation of eigenfunctions by a local amplitude and a phase integral. This program has been carried out in the case of vector-valued functions of one variable. 1981, North-Holland Publishing Company