The Higher Order Approximation of Solution of Quasilinear Second Order Systems for Singular Perturbation

In this paper, using the theory of invariant region, the author considers the existence and the asymptotic behavior of solution of vector second order quasi-linear boundary value problem: $epsilon y''=f(x,y,epsilon)y''+g(x,y,epsilon)$$y(0,epsilon)=A(epsilon),y(1,epsilon)=B(epsilon)$as the positive perturbation parameter e tends to zero, where y, g, A and B are vector-valued and f is a matrix function. Under the appropriate assumptions the author obtains, involving the boundary layer, uniformly valid asymptotic solution of higher order approximation.