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Error-estimates for the method of least squares of finding eigenvalues and eigenfunctions. (English) Zbl 0211.16501

MSC:
47A70 (Generalized) eigenfunction expansions of linear operators; rigged Hilbert spaces
47A75 Eigenvalue problems for linear operators
47B25 Linear symmetric and selfadjoint operators (unbounded)
47A58 Linear operator approximation theory
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