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On the importance of Turing completenessIn taking a graduate class in theoretical computer science, I developed a question that was never answered in a way that I felt comfortable with accepting, and now I can't stop thinking about it. We discussed that most computer languages are Turing complete, but did not discuss why that is necessary. When I asked, I got an answer of the type: because there are problems only solvable by Turing complete languages. Yet, I feel no examples coming immediately to mind. Pushdownautomata or stacks are always decidable, and there is an enormous amount of problems that can be solved using them. Also, very many practical problems can be solved in the form of a graph. Yet, many other problems can be solved with primitive recursion which is also decidable. So, I still feel like I am missing something; what are the practical benefits of making a language Turing complete? Or to ask another side of the question: what practical benefits would be lost by not being Turing complete? Any help on this one, I would tremendously appreciate. By jdgallag at 20080611 16:49  LtU Forum  previous forum topic  next forum topic  other blogs  45724 reads

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