Recognizable vs Decidable - Mathematics Stack Exchange A language is Recognizable iff there is a Turing Machine which will halt and accept only the strings in that language and for strings not in the language, the TM either rejects, or does not halt at all Note: there is no requirement that the Turing Machine should halt for strings not in the language
prove Turing recognizable - Mathematics Stack Exchange Prove that the complement of L is Turing-recognizable I know the definition of Turing recognizable but when it comes to make an example it is really difficult for me In Sipser's book he only proof that ATM is Turing recognizable but it is kind of abstract for me What I have done for this question is (I am not sure at all)
Show the projection of decidable language is Turing-recognizable Stack Exchange Network Stack Exchange network consists of 183 Q A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers
Why is decidable included in Turing-recognizable? Turing-recognizable languages are languages whice are accepted by a Turing machine; decidable languages are languages for which a Turing machines halts, i e either accepts or rejects, but never loops This would make me think that decidable languages include Turing-recognizable languages, and not viceversa
Is F decidable, Turing-recognizable, co-Turing-recognizable Stack Exchange Network Stack Exchange network consists of 183 Q A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers
Simple concrete example of a language that is Turing recognizable but . . . The set of string encodings of instances of the Post Correspondence Problem that have matches is a language that is recognizable but not decidable, as discussed in Sipser's Introduction to the Theory of Computation, Third Edition, chapter 5, pages 227-233 The discussion includes a proof of undecidability by reduction from the language of
computability - Is this undecidable language recognizable . . . Stack Exchange Network Stack Exchange network consists of 183 Q A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers
Can a problem be undecidable but yet Turing recognizable? Can a promblem be undecidable but yet be fully Turing recognizable? For example - if language is Turing recognizable OR it's complement is Turing recognizable - so it still undecidable? And another question - does Atm is np or np hard? Does a list of all the configuration that accepts the word w can be verifier? Thanks!
computer science - Understanding Turing Machines: Recognizable and . . . $\begingroup$ Don't know about hangs, that is an unnecessary concept Turing decidable means it halts in an accepting state if the input word is in the language, and halts in a rejecting state if the word is not in the language, Turing recognizable means it halts in an accepting state if the word is in the language, and in a rejecting state or fails to halt if the word is not in the language