Najzar, K. On the method of least squares of finding eigenvalues and eigenfunctions of some symmetric operators. II. (English) Zbl 0211.16402 Commentat. Math. Univ. Carol. 11, 449-462 (1970). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Review 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) Citations:Zbl 0211.16501 PDFBibTeX XMLCite \textit{K. Najzar}, Commentat. Math. Univ. Carol. 11, 449--462 (1970; Zbl 0211.16402) Full Text: EuDML