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Chapter Notes
Alan Turing introduced the Turing machine, gave an example of a universal machine and
demonstrated the unsolvability of the halting problem in [ 338 ]. A similar model was inde-
pendently developed by Post [ 255 ]. Chomsky [69] demonstrated the equivalence of phrase-
structure languages. Rice's theorem is presented in [ 280 ].
Church gave a formal model of computation in [ 72 ]. The equivalence between the partial
recursive functions and the Turing computable functions was shown by Kleene [ 168 ].
For a more extensive introduction to Turing machines, see the topics by Hopcroft and
Ullman [ 141 ] and Lewis and Papadimitriou [ 200 ].
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