Approximation of functions on a segment by biorthogonal series that are connected with second-order differential operators

Publication date: 8 October 1997

Published in: Doklady Mathematics (Search for Journal in Brave)

Schrödinger operators order of approximation root functions biorthogonal expansions Fourier series in root functions

Fourier series in special orthogonal functions (Legendre polynomials, Walsh functions, etc.) (42C10) Approximation by other special function classes (41A30) Nonlinear ordinary differential operators (34L30)

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