Choose the correct option: Statement: If L1 and L2 are recursively enumerable languages over S, then the following is/are recursively enumerable.

Choose the correct option: Statement: If L1 and L2 are recursively enumerable languages over S, then the following is/are recursively enumerable. Correct Answer Both L1 U L2 and L2 ∩ L2

Both the union and intersection operations preserve the property of recursive enumerablity(Theorem).
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Related Questions

Recursively enumerable languages are not closed under ______________
Simplify : $${{{5 \over 3} \times {7 \over {51}}{\text{ of }}{{17} \over 5} - {1 \over 3}} \over {{2 \over 9} \times {5 \over 7}{\text{ of }}{{28} \over 5} - {2 \over 3}}}$$
Assume statements S1 and S2 defined as: S1: L2-L1 is recursive enumerable where L1 and L2 are recursive and recursive enumerable respectively. S2: The set of all Turing machines is countable. Which of the following is true?
A language L is recursively enumerable if L=L(M) for some turing machine M. Which among the following cannot be among A, B and C?
Which of the following is/are not true for recursively enumerable language?
The class of recursively enumerable language is known as:
A recursively enumerable language L can be recursive if:
The expression obtained by recursively producing a left expression, followed by an operator, followed by recursively producing a right expression is called?
A,B,C,D,E,G and I are seven friends who study in three different standards namely 5th, 6th and 7th such that not less than two friends study in the same standard. Each friend also has a different favorite subject namely History, Civics, English, Bangla, Science , Maths , and Economics but not necessarily in the same order. A likes Maths and studies in the 5th standard with only one other friend who likes Bangla. I studies with tow other friends . Both the friends who study with I like languages (Here languages include only Science , English and Bangla ) . D studies in the 6th standard with only one person and does not like Civics . E studies with only one friend . The one who likes history does not study in 5th or 6th standard . E does not like languages. C does not like English , Science or Civics. Which combination represents E's favorite subject and the standard in which he studies?
The following two statements relate to financial derivatives. Choose the correct answer for statements being correct or incorrect.
Statement I When an option is allowed to be exercised only on the maturity date, it is called an American option.
Statement II If the option holder does not lose or gain whether he exercise his option or buys or sells the asset form the market, the option is said to be at-the-money.