
Church’s Thesis makes the claim that all reasonable formal models of computa- tion are equivalent. And we showed in. Section 17.4. a construetion that proved that a simple accumulator/register machine can be implemented as a Turing ma- chine. By extending that construction, we can show that any computer can be im- plemented as a Turing machine. So the existence of a decision procedure (stated in any notation that makes the algorithm clear) to answer a question means
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