Geodesic
Asymptotic behaviour of a boundary layer solution to a stationary partly dissipative system with a multiple root of the degenerate equation
Sbornik. Mathematics, Tome 210 (2019) no. 11, pp. 1581-1608 Cet article a éte moissonné depuis la source Math-Net.Ru

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We construct asymptotics with respect to a small parameter of a boundary layer solution of the boundary value problem for a system of two ordinary differential equations, one second order and the other first order, with a small parameter multiplying the derivatives in both equations. Systems of this type arise in chemical kinetics as stationary processes in models of fast reactions in the absence of diffusion for one of the reactants. An essential feature of the problem under study is a double root of one of the equations of the degenerate system. This leads to a qualitative change in the boundary layer component of the solution by comparison with the case when all the roots are simple. The boundary layer becomes multizoned, while the standard algorithm for constructing boundary layer series is no longer suitable and has to be replaced by a new one. Bibliography: 13 titles.
Keywords: singularly perturbed problem with multiple root of the degenerate equation, partly dissipative system, multizone boundary layer. 
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V. F. Butuzov. Asymptotic behaviour of a boundary layer solution to a stationary partly dissipative system with a multiple root of the degenerate equation. Sbornik. Mathematics, Tome 210 (2019) no. 11, pp. 1581-1608. http://geodesic.mathdoc.fr/item/SM_2019_210_11_a3/

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