Isotropic

A cellular automaton is said to be isotropic if its global transition function is isotropic, i.e. invariant under rotations and reflections. Cellular automata that are not isotropic are called anisotropic or non-isotropic.

There are 2¹⁰² isotropic Life-Like rules, and 2⁵¹² MAP rules. The 2⁵¹² figure includes all outer-totalistic, isotropic, and anisotropic Life-like rules. Totalistic rules are a strict subset of outer-totalistic rules, which in turn are a strict subset of isotropic rules. Isotropic and anisotropic rules together make up the full complement of 2⁵¹² MAP rules.

Isotropic rules are most often represented in Hensel notation, but like any other possible 2-state rule in a range-1 Moore neighbourhood, they can also be encoded as MAP rule strings.

Also see

gollark: That's also separate from being free to *believe* things you might not agree with.

gollark: It depends what you mean by "freedom of speech", really, it's a loosely defined term.

gollark: Yes, might.

gollark: Preemptively harming people who might harm you if they were in a different position is very problematic.

gollark: I mean, I'd agree with that assessment, I just wouldn't agree with attacking them because of it.

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