DCDS
Shadowing near nonhyperbolic fixed points
Alexey A. Petrov Sergei Yu. Pilyugin
We use Lyapunov type functions to find conditions of finite shadowing in a neighborhood of a nonhyperbolic fixed point of a one-dimensional or two-dimensional homeomorphism or diffeomorphism. A new concept of shadowing in which we control the size of one-step errors is introduced in the case of a nonisolated fixed point.
keywords: Lyapunov function. shadowing Dynamical system fixed point

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