This is the current version of a short book about atoms that I am writing (it is currently in feature freeze). The book begins with a discussion of automata models for infinite alphabets. Then, inspired by these automata, the book develops the theory of orbit-finite sets with atoms and computation on them.
At the current stage, I do not intend to add new material except for: fixing errors, an introduction, exercises and their solutions. If you find mistakes in the current version, please put them preferably here or otherwise here.
All versions:
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