Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Thue (pronounced /'tu:e / "TOO-ay") is an esoteric programming language invented by John Colagioia in early 2000. It is a meta-language that can be used to define or recognize Type-0 languages from the Chomsky hierarchy. Because it is able to define languages of such complexity, it is also Turing-complete itself. Thue is based on a nondeterministic string rewriting system called semi-Thue grammar, which itself is named after (and possibly created by) the Norwegian mathematician Axel Thue; inspiration is also taken from the grue. The author describes it as follows: "Thue represents one of the simplest possible ways to construe constraint-based programming. It is to the constraint-based paradigm what languages like OISC are to the imperative paradigm; in other words, it's a tar pit."

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