In this paper I deal only with automatic machines, and will therefore often omit the prefix ɑ-.
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About Alan Turing
Alan Turing was a 20th-century English computer scientist. Alan Mathison Turing was an English mathematician, computer scientist, logician, cryptanalyst, philosopher and theoretical biologist. He was highly influential in the development of theoretical computer science, providing a formalisation of the concepts of algorithm and computation with the Turing machine, which can be considered a model of a general-purpose computer. Read more on Wikipedia →