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On the method of least squares of finding eigenvalues and eigenfunctions of some symmetric operators. II. (English) Zbl 0211.16402

MSC:
47A10 Spectrum, resolvent
41A50 Best approximation, Chebyshev systems
47A70 (Generalized) eigenfunction expansions of linear operators; rigged Hilbert spaces
47A58 Linear operator approximation theory
47B25 Linear symmetric and selfadjoint operators (unbounded)
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