Define unrecognisable and undecidable languages.
Question
Define unrecognisable and undecidable languages.
Solution
Unrecognisable Languages: In the context of theoretical computer science and formal language theory, an unrecognisable language is a language for which no Turing machine exists that accepts exactly that language. In other words, there is no algorithm that can determine, given a string, whether that string is in the language or not.
Undecidable Languages: An undecidable language, on the other hand, is a language for which there is no algorithm that can decide whether a given string is in the language or not in a finite amount of time. This means that there might be a Turing machine that accepts the language, but it might run forever on some inputs.
In summary, an unrecognisable language is one for which no Turing machine exists that accepts exactly that language, while an undecidable language is one for which no algorithm can decide membership in a finite amount of time.
Similar Questions
When can we say that the language is decidable or undecidable?
A language L is said to be ____________ if there is a Turing machine M such that L(M)=L and M halts at every point.ans.undecidablenone of the mentionedTuring acceptabledecidable
The concept of "decidability" in the context of languages refers to:a.The ability to generate strings in a language.b.The ability to recognize a language efficiently.c.The existence of an algorithm that determines membership in a language.d.The ability to simulate any Turing machine
Select all languages that are known to be decidable.1 point{x}, where x is some specific string{}{x#y#xy | x and y are strings over {a, b}}HALTS = {(M, x) | M halts on input x}{x: x = aba and Goldbach conjecture is True}
The Halting Problem is:a.Semi-decidableb.Decidablec.Triviald.Undecidable
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