Singularly perturbed boundary value problems for systems of Tichonov’s type in case of exchange of stabilitiesстатья
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Аннотация:We consider a system of ordinary differential equations consisting of a singularly perturbed scalar differential equation of second order and a scalar differential equation of first or second order and study a Neumann-Cauchy or a Neumann-Dirichlet problem. We assume that the degenerate equation has two intersecting solutions such that the standard theory for systems of Tichonov’s type cannot be applied. We introduce the notation of a degenerate stable solution. By means of the technique of ordered lower and upper solutions we prove the existence of a solution of our problems near the degenerate stable solution for sufficiently small epsilon and determine its asymptotic behavior in epsilon. (C) 1999 Academic Press.