scientific article; zbMATH DE number 3404695
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Publication:5670961
zbMath0256.34014MaRDI QIDQ5670961
Publication date: 1972
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Linear symmetric and selfadjoint operators (unbounded) (47B25) Spline approximation (41A15) Nonlocal and multipoint boundary value problems for ordinary differential equations (34B10) Ordinary differential operators (34L99) Approximation by arbitrary linear expressions (41A45)
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