- Computer Science Engineering (CSE)
- Theory of Computation
- Unit 1
- The regular sets are closed under:

Q. |
## The regular sets are closed under: |

A. | Union |

B. | Concatenation |

C. | Kleene closure |

D. | All of the above |

Answer» D. All of the above |

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Theory of Computation

- Consider the following statements I. Recursive languages are closed under complementation II. Recursively enumerable languages are closed under union III. Recursively enumerable languages are closed under complementation Which of the above statement are TRUE?
- Which of the following statements is/are FALSE? (1) For every non-deterministic Turing machine, there exists an equivalent deterministic Turing machine. (2) Turing recognizable languages are closed under union and complementation. (3) Turing decidable languages are closed under intersection and complementation (4) Turing recognizable languages are closed under union and intersection.
- Let P be a regular language and Q be context-free language such that Q ∈ P. (For example, let P be the language represented by the regular expression p*q* and Q be {pnqn n∈ N}). Then which of the following is ALWAYS regular?
- A language is represented by a regular expression (a)*(a + ba). Which of the following strings does not belong to the regular set represented by the above expression?
- Which of the following are decidable? 1) Whether the intersection of two regular language is infinite. 2) Whether a given context free language is regular. 3) Whether two push down automata accept the same language. 4) Whether a given grammar is context free.
- Languages are proved to be regular or non regular using pumping lemma.
- Which of the following are regular sets?
- Context free grammar is not closed under
- The Family of recursive language is not closed under which of the following operations:
- Recursively enumerable languages are not closed under

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