Let L₁ Be a Regular Language, L₂ Be a Deterministic

question 16

Multiple Choice

Let L₁ be a regular language, L₂ be a deterministic context-free language and L₃ a recursively enumerable, but not recursive, language. Which one of the following statements is false?

• A)L₁ n L₂ is a deterministic CFL
• B)L₃ n L₁ is recursive
• C)L₁ U L₂ is context free
• D)L₁ n L₂ n L₃ is recursively enumerable

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