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Construction of a local and global Lyapunov function for discrete dynamical systems using radial basis functions. (English) Zbl 1162.39006

The author investigates a method of determining the basin of attraction of an asymptotically stable fixed point x ¯ of a discrete time autonomous dynamical system x n+1 =g(x n ) (where gC σ (R d ,R d ), using Lyapunov functions constructed by approximating the solution V(x) of the equation V(g(x))-V(x)=-x-x ¯ 2 . The author makes reference to P. Giesl [J. Difference Equ. Appl. 13, No. 6, 523–546 (2007; Zbl 1120.39018)] for a constructive existence theorem for a smooth solution U of the above difference equation.

However, he seems unaware of the result of St. Balint, E. Kaslik, A. M. Balint and A. Grigis [Adv. Difference Equ., Article ID23939 (2006; Zbl 1134.39013)] (and the references within) which addresses a similar problem. Considering the solution V(x) of the above difference equation and its Taylor polynomial like functions n(x), the function W(x)=V(x) n(x) is constructed and its properties are given. Approximations of w(x) and W(x) are constructed, using radial basis functions, and local and global error estimates are provided. It is shown that the function v defined by v(x)=n(x)·w(x) is a local and global Lyapunov function. Two examples confirming the effectiveness of proposed method are presented.

MSC:
39A11Stability of difference equations (MSC2000)
37B25Lyapunov functions and stability; attractors, repellers
37C25Fixed points, periodic points, fixed-point index theory
39A12Discrete version of topics in analysis
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