Decidable languages are languages such that the problem of whether a given word belongs to it or not is decidable. A decision problem, i.e., a question with a yes/no answer, is called decidable if there exists an algorithm (a Turing machine) that can and will return a Boolean true or false value (instead of looping indefinitely).
Questions tagged [decidable]
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Recursively Decidable language, acceptance of infinite language
So it is my understanding that Recursively Decidable languages are the languages that we can build a Turing Machine such that given an input w from that language, Turing Machine will always either accept and halt or reject and halt. What I am…

Saik
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Why decider D behaves the opposite when it is using decider H as a subroutine?
Acoordind to paragraph shown, how decider D uses H as a subroutine and how it is behaving the opposite ?
It would be very useful if someone clarify this ?

Garrick
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