Recursively enumerable languages are not closed under

Related MCQs

• 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.
• Recursively enumerable languages are not closed under
• Recursively enumerable languages are not closed under:
• Let L1 be a recursive language. Let L2 and L3 be languages that are recursively enumerable but not recursive. Which of the following statements is not necessarily true?
• Let L1 be a recursive language, and let L2 be a recursively enumerable but not a recursive language. Which one of the following is TRUE?
• If L and L¯ are recursively enumerable, then L is
• The languages -------------- are the examples of non regular languages.
• Context free grammar is not closed under
• The Family of recursive language is not closed under which of the following operations: