3. Which of the following statements are false? Explanation: Every recursive language is recursively enumerable but there exists recursively enumerable languages that are not recursive . If L is accepted by a Non deterministic TM T, and every possible sequence of moves of T causes it to halt, then L is recursive.
Which is false about recursive language?
3. Which of the following statements are false? Explanation: Every recursive language is recursively enumerable but there exists recursively enumerable languages that are not recursive . If L is accepted by a Non deterministic TM T, and every possible sequence of moves of T causes it to halt, then L is recursive.
What languages are recursive?
All regular, context-free and context-sensitive languages are recursive.
How do you know if a language is recursive?
A language is recursive if there exists a Turing machine that accepts every string of the language and rejects every string (over the same alphabet) that is not in the language . Note that, if a language L is recursive, then its complement -L must also be recursive.
Which of the following statement is false recursively enumerable?
Computer Science Engineering (CSE) Question
So, every recursive language is also recursively enumerable. Thus, the statement ‘ Every subset of a recursively enumerable set is recursive’ is false. Thus, option (C) is the answer.
Is recursive language type 0?
Recursive languages are: A proper superset of context free languages . Always recognizable by pushdown automata. Also called type 0 languages.
What is the difference between recursive and recursively enumerable language?
The main difference is that in recursively enumerable language the machine halts for input strings which are in language L. but for input strings which are not in L, it may halt or may not halt. When we come to recursive language it always halt whether it is accepted by the machine or not.
What is a non recursive language?
An example of a language which is not recursively enumerable is the language L of all descriptions of Turing machines which don’t halt on the empty input.
What is recursive thinking?
1. The process of solving large problems by breaking them down into smaller, simpler problems that have identical forms .
What is an example of recursion?
A classic example of recursion
The classic example of recursive programming involves computing factorials . The factorial of a number is computed as that number times all of the numbers below it up to and including 1. For example, factorial(5) is the same as 5*4*3*2*1 , and factorial(3) is 3*2*1 .
What is complement of recursive language?
Complements of Recursive and Recursively Enumerable Languages. A recursive language is one that is accepted by a TM that halts on all inputs. The complement of a recursive language is recursive . If a language L and its complement are RE, then L is recursive. A language can be RE but its complement need not be RE.
Is the family of recursively enumerable languages closed under intersection?
Recursively enumerable languages are also closed under intersection, concatenation, and Kleene star.
Is recursive language accepted by Turing machine?
The turing machine accepts all the language even though they are recursively enumerable. Recursive means repeating the same set of rules for any number of times and enumerable means a list of elements.
Which language is accepted by Turing machine?
Explanation: The language accepted by Turing machines are called recursively ennumerable (RE) , and the subset of RE languages that are accepted by a turing machine that always halts are called recursive.
Which of the following statement is wrong every recursive language is recursively enumerable?
A recursive language can’t go into an infinite loop, it has to clearly reject the string, but a recursively enumerable language can go into an infinite loop. So, every recursive language is also recursively enumerable. Thus, the statement ‘ Every subset of a recursively enumerable set is recursive ‘ is false.
Which of the following statement is incorrect about recursion?
9. Which of the following statements is false about recursion? Explanation: A recursive function needn’t have a return value.
