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Title: The Basis Property Of Sturm–Liouville Problems With Boundary Conditions Depending Quadratically On The Eigenparameter
Authors: Aliyev, Yakub N.
Kerimov, Nazim B.
Keywords: Sturm–Liouville
eigenparameter-dependent boundary conditions
minimal system
quadratically close systems
Issue Date: 2008
Publisher: King Fahd University of Petroleum and Minerals
Citation: Arabian Journal for Science and Engineering
Series/Report no.: vol. 33;№ 1
Abstract: We study basisness of root functions of Sturm–Liouville problems with a boundary condition depending quadratically on the spectral parameter. We determine the explicit form of the biorthogonal system. Using this we prove that the system of root functions, with arbitrary two functions removed, form a minimal system in L2, except some cases where this system is neither complete nor minimal. For the basisness in L2 we prove that the part of the root space is quadratically close to systems of sines and cosines. We also consider these basis properties in the context of general Lp.
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