# Invariant manifolds for a singular ordinary differential equation

Blanchini, S; Spinolo, L V (2011). Invariant manifolds for a singular ordinary differential equation. Journal of Differential Equations, 250(4):1788-1827.

## Abstract

We study the singular ordinary differential equation $$\frac{d U}{d t} = f (U) / z (U) + g (U),$$ where $U \in R^N$, the functions $f \in R^N$ and $g \in R^N$ are of class $C^2$ and $z$ is a real valued $C^2$ function. The equation is singular in the sense that $z (U)$ can attain the value 0. We focus on the solutions of the singular ODE that belong to a small neighborhood of a point $\bar U$ such that $f (\bar U) = g (\bar U) = \vec 0$, $z (\bar U) =0$. We investigate the existence of manifolds that are locally invariant for the singular ODE and that contain orbits with a suitable prescribed asymptotic behaviour. Under suitable hypotheses on the set $\{U: z (U) = 0 \}$, we extend to the case of the singular ODE the definitions of center manifold, center stable manifold and of uniformly stable manifold. An application of our analysis concerns the study of the viscous profiles with small total variation for a class of mixed hyperbolic-parabolic systems in one space variable. Such a class includes the compressible Navier Stokes equation.

## Abstract

We study the singular ordinary differential equation $$\frac{d U}{d t} = f (U) / z (U) + g (U),$$ where $U \in R^N$, the functions $f \in R^N$ and $g \in R^N$ are of class $C^2$ and $z$ is a real valued $C^2$ function. The equation is singular in the sense that $z (U)$ can attain the value 0. We focus on the solutions of the singular ODE that belong to a small neighborhood of a point $\bar U$ such that $f (\bar U) = g (\bar U) = \vec 0$, $z (\bar U) =0$. We investigate the existence of manifolds that are locally invariant for the singular ODE and that contain orbits with a suitable prescribed asymptotic behaviour. Under suitable hypotheses on the set $\{U: z (U) = 0 \}$, we extend to the case of the singular ODE the definitions of center manifold, center stable manifold and of uniformly stable manifold. An application of our analysis concerns the study of the viscous profiles with small total variation for a class of mixed hyperbolic-parabolic systems in one space variable. Such a class includes the compressible Navier Stokes equation.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Institute of Mathematics 510 Mathematics English February 2011 17 Feb 2012 20:10 17 Feb 2018 15:04 Academic Press 0022-0396 (P) 1090-2732 (E) Hybrid https://doi.org/10.1016/j.jde.2010.11.010 http://arxiv.org/abs/0801.4425

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