Let's pretend that L1 is a recursive language. Let L2 and L3 be recursively enumerable but not recursive languages. Which of the following statements is unlikely to be correct? L2 – L1 can be enumerated in a recursive manner. L1–L3 can be enumerated in a recursive manner. L2 is enumerable in a recursive manner. L2 is enumerable in a recursive manner.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Let's pretend that L1 is a recursive language. Let L2 and L3 be recursively enumerable but not recursive languages. Which of the following statements is unlikely to be correct?

  1. L2 – L1 can be enumerated in a recursive manner.
  2. L1–L3 can be enumerated in a recursive manner.
  3. L2 is enumerable in a recursive manner.
  4. L2 is enumerable in a recursive manner.
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