Abstract
Universality in cellular automata (CAs), first studied by von Neumann, has attracted much research efforts over the years, especially for CA employing synchronous timing. This paper proposes a computation- and construction-universal CA with a von Neumann neighborhood that is updated in a purely asynchronous way, rather than by the conventional but less efficient way of simulating synchronous CAs on asynchronous CAs. The proposed asynchronous CA is capable of implementing self-reproducing machines. Our model employs strongly symmetric cells with 15 states.
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