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Characterizing asymptotic stability with Dulac functions
This paper studies questions regarding the local and global asymptotic stability of analytic
autonomous ordinary differential equations in $\mathbb{R}^n$. It is well-known that such stability
can be characterized in terms of Liapunov functions. The authors prove similar results for the
more geometrically motivated Dulac functions. In particular it holds that any analytic autonomous
ordinary differential equation having a critical point which is a global attractor admits a Dulac
function. These results can be used to give criteria of global attraction in two-dimensional
systems.