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CS381hw11 - 4 Which of the follow classes of languages are...

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CS381 Homework Assignment Number 11 due Friday, Nov. 11, 2005 Please write your name and net id on the upper right corner of each page . 1. Prove that the halting problem for Turing machine is undecidable. 2. State Rice’s theorem and write out a clear proof. 3. Construct a set that is not r.e. and whose complement is not r.e.
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Unformatted text preview: 4. Which of the follow classes of languages are closed under complement? Which are not closed under complement? Justify each answer. Finite sets, regular sets, context-free languages, recursive sets, r.e. sets...
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