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An efficient numerical method for solving nonlinear Thomas-Fermi equation

By Parand Kourosh, Rabiei Kobra and Delkhosh Mehdi

Abstract

In this paper, the nonlinear Thomas-Fermi equation for neutral atoms by using the fractional order of rational Chebyshev functions of the second kind (FRC2), FUnα(t,L)${\rm{FU}}_{\rm{n}}^\alpha \left( {{\rm{t}},{\rm{L}}} \right)$ (t, L), on an unbounded domain is solved, where L is an arbitrary parameter. Boyd (Chebyshev and Fourier Spectral Methods, 2ed, 2000) has presented a method for calculating the optimal approximate amount of L and we have used the same method for calculating the amount of L. With the aid of quasilinearization and FRC2 collocation methods, the equation is converted to a sequence of linear algebraic equations. An excellent approximation solution of y(t), y′ (t), and y ′ (0) is obtained

Topics: Thomas-Fermi equation, fractional order of rational Chebyshev functions, quasilinearization method, collocation method, unbounded domain, 34B16, 34B40, 65N35, Mathematics, QA1-939
Publisher: Sciendo
Year: 2018
DOI identifier: 10.2478/ausm-2018-0012
OAI identifier: oai:doaj.org/article:f57095064c3045d08b181c6190ce9b5b
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