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: Since you're me, this is isomorphic to an admission that I do.
gollark: As me, you have authority over time scheduling, so you can reassign 2026 to 2022 if you want.
gollark: 2026.
gollark: It is not fully independent.
gollark: What if Olivia picks this theme?
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