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Linear approximation and asymptotic expansion associated with the system of nonlinear functional equations

Ngoc L. T. P., Dung H. T. H., Danh P. H., Long N. T.

Demonstratio Mathematica

2014

Vol. 47, nr 1

103--124

This paper is devoted to the study of the following perturbed system of nonlinear functional equations (…) , where ε is a small parameter, aijk; bijk are the given real constants, Rijk; Sijk; Xijk : (…) are the given continuous functions and (…) are unknown functions. First, by using the Banach fixed point theorem, we find sufficient conditions for the unique existence and stability of a solution of (E). Next, in the case of (…) ; we investigate the quadratic convergence of (E). Finally, in the case of (…) and ε sufficiently small, we establish an asymptotic expansion of the solution of (E) up to order N + 1 in ε. In order to illustrate the results obtained, some examples are also given.

On the nonlinear wave equation with the mixed nonhomogenous conditions: linear approximation and asymptotic expansion of solutions

Long N. T., Tam N. C., Truc N. T. T.

Demonstratio Mathematica

2005

Vol. 38, nr 2

365--386

In this paper we consider the following nonlinear wave equation (1) utt-uxx = f(x,t,u,ux,ut), x is an element of (0,l), 0 < t < T, (2) ux(0,t)-hou(0,t)=go(t), u(1,t) = g1(t), (3) u(x,0) = uo(x), ut((x,0) = u1x).

Linear approximation and asymptotic expansion associated with the system of functional equations

Long N.

Demonstratio Mathematica

2004

Vol. 37, nr 2

349--362

Asymptotic expansion of the solution for nonlinear wave equation with mixed non-homogeneous conditions

Long N. T., Dinh A. P. N., Diem T. N.

Demonstratio Mathematica

2003

Vol. 36, nr 3

683--695