Separable Lyapunov functions for monotone systems: Constructions and limitations.

Gunther Dirr, Hiroshi Ito, Anders Rantzer, Björn Rüffer

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For monotone systems evolving on the positive orthant, two types of Lyapunov functions are considered: Sum- and max-separable Lyapunov functions. One can be written as a sum, the other as a maximum of functions of scalar arguments. Several constructive existence results for both types are given. Notably, one construction provides a max-separable Lyapunov function that is defined at least on an arbitrarily large compact set, based on little more than the knowledge about one trajectory. Another construction for a class of planar systems yields a global sum-separable Lyapunov function, provided the right hand side satisfies a small-gain type condition. A number of examples demonstrate these methods and shed light on the relation between the shape of sublevel sets and the right hand side of the system equation. Negative examples show that there are indeed globally asymptotically stable systems that do not admit either type of Lyapunov function.
Original languageEnglish
Pages (from-to)2497-2526
JournalDiscrete and Continuous Dynamical Systems. Series B
Issue number8
Publication statusPublished - 2015

Subject classification (UKÄ)

  • Other Mathematics


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