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The definition of the set of allowable operations used for computation and their respective costs. Some examples of models include Turing machines, recursive functions, lambda calculus, and production systems.

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Does every turing machine have an equivalent, single-state, n-tape turing machine?

On all the comments: Usually a TM is used to compute something, e.g. a yes/no about word \in language. Therefore, either we are nit-picking and require at least two halting states (accept, reject) PLU …
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