Analytic one-dimensional maps and two-dimensional ordinary differential equations can robustly simulate Turing machines

Daniel S. Graça; Ning Zhong

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arXiv · 2109.15073

Analytic one-dimensional maps and two-dimensional ordinary differential equations can robustly simulate Turing machines

Daniel S. Graça·Ning Zhong

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Abstract

In this paper, we analyze the problem of finding the minimum dimension $n$ such that a closed-form analytic map/ordinary differential equation can simulate a Turing machine over $\mathbb{R}^{n}$ in a way that is robust to perturbations. We show that one-dimensional closed-form analytic maps are sufficient to robustly simulate Turing machines; but the minimum dimension for the closed-form analytic ordinary differential equations to robustly simulate Turing machines is two, under some reasonable assumptions. We also show that any Turing machine can be simulated by a two-dimensional $C^{\infty}$ ordinary differential equation on the compact sphere $\mathbb{S}^{2}$.

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BibTeX RIS

Daniel S. Graça, Ning Zhong. 2021-09-30. Analytic one-dimensional maps and two-dimensional ordinary differential equations can robustly simulate Turing machines. https://arxiv.org/abs/2109.15073

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