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?

  1. L1 $\cap$ L is a deterministic CFL
  2. L3 $\cap$ L1 is recursive
  3. L1 U L2 is context free

  4. L1 $\cap$ L2 $\cap$ L3 is recursively enumerable
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation