ROBUST NON-COMPUTABILITY OF DYNAMICAL SYSTEMS AND COMPUTABILITY OF ROBUST DYNAMICAL SYSTEMS

In this paper, we examine the relationship between the stability of the dynamical system x ' = f ( x ) and the computability of its basins of attraction. We present a computable C infinity system x ' = f ( x ) that possesses a computable and stable equilibrium point, yet whose basin of attraction is robustly non-computable in a neighborhood of f in the sense that both the equilibrium point and the non-computability of its associated basin of attraction persist when f is slightly perturbed. This indicates that local stability near a stable equilibrium point alone is insufficient to guarantee the computability of its basin of attraction. However, we also demonstrate that the basins of attraction associated with a structurally stable - globally stable (robust) - planar system defined on a compact set are computable. Our findings suggest that the global stability of a system and the compactness of the domain play a pivotal role in determining the computability of its basins of attraction.