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On Turing Machines

  1. May 18, 2017 #1
    It's been a while since I've done this, but the question spurred on. Is there any sort of named class that a machine that can decide on all Turing decidable problems would belong to?

    Edit: Actually, I guess it would be Turing if you could program it to decide on a particular problem.
    Last edited: May 18, 2017
  2. jcsd
  3. May 21, 2017 #2


    Staff: Mentor

    Can you rephrase your question a bit?

    Are you looking for actual code in Java or C++ or some generic algorithm?
  4. May 21, 2017 #3


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    Science Advisor
    Gold Member

    You must put your question in a more clear way as jedishrfu points out. A problem is decidable if there is an algorithm to answer it. As you may know an algorithm - formally speaking, is a TM that halts on all inputs whether accepted or not. So, effectively a decidable problem is equivalent to a recursive language. Now, just by guesswork, is your question about a UTM (Universal Turing Machine)? Because in this case the language ##L_{u}## of UTM is not recursive but recursively enumerable.
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