Stephen writes: “Three most used non-biological examples I've seen are:
* ferromagnetism (described with ising model) [..] The Ising model is just a model, however. Even though an Ising system can encode functions, I don’t think that arbitrary functions are found in nature. As a ridiculous example, show me a division function that occurs as a metastable crystal in the wild. There are some Ising model instances that would be irregular arrangements of atoms and maybe even impossible to form without an apparatus. Marcus
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