Recursively enumerable languages are not closed under ______________
Correct Answer: C
Recursive languages are closed under the following operations.
The Kleene star L * of L
the concatenation L * o P of L and P
the union L U P
the intersection L ? P.
A CFG G is given with the following productions where S is the start symbol, A is a non-terminal and a and b are terminals. S?aS?A A?aAb?bAa?? Which of the following strings is generated by the grammar above?
Every regular language can be produced by context free grammar and context free language can be produced by context sensitive grammar and so on.
Find the context sensitive language from the given diagram
