Nonlocal and global dynamics of cellular automata: A theoretical computer arithmetic for real continuous maps

TL;DR

This paper introduces a digit function within $\

Contribution

It develops universal, parameter-free maps for cellular automata's local, nonlocal, and global dynamics, linking continuous maps with CA behavior through Diophantine approximation.

Findings

Derived universal maps for cellular automata dynamics.

Established correspondence between bifurcation diagrams and Wolfram classes.

Applied method to logistic map, revealing CA analogs of chaos and periodicity.

Abstract

A digit function is presented which provides the $i$th-digit in base $p$ of any real number $x$. By means of this function, formulated within $\mathcal{B}$-calculus, the local, nonlocal and global dynamical behaviors of cellular automata (CAs) are systematically explored and universal maps are derived for the three levels of description. None of the maps contain any freely adjustable parameter and they are valid for any number of symbols in the alphabet $p$ and neighborhood range $\rho$. A discrete general method to approximate any real continuous map in the unit interval by a CA on the rational numbers $\mathbb{Q}$ (Diophantine approximation) is presented. This result leads to establish a correspondence between the qualitative behavior found in bifurcation diagrams of real nonlinear maps and the Wolfram classes of CAs. The method is applied to the logistic map, for which a logistic CA is derived. The period doubling cascade into chaos is interpreted as a sequence of global cellular automata of Wolfram's class 2 leading to Class 3 aperiodic behavior. Class 4 behavior is also found close to the period-3 orbits.