June 2016
Intermediate to advanced
1168 pages
38h 16m
English
Content preview from Computer Science: An Interdisciplinary Approach
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Q&A
Q. Is it really possible to build a Turing machine that simulates a conventional computer like the microprocessor in my laptop?
A. Yes. This is precisely what the Church–Turing thesis says. The classic book by Minsky includes a blueprint for such a Turing machine.
Q. Isn’t the Turing machine model strictly more powerful than real computers, because Turing machines have infinite tapes while real computers have finite memories?
A. In a technical sense, yes. You can simulate a real computer with a massive DFA. However, that DFA would need more 21,000,000,000 states to model a computer with 1GB of memory! While a real computer can access only a finite amount of memory, in practice that amount is nearly limitless if you include the Internet. ...
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