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if it halts

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Q: Undecidable Problem that is recursive enumerable?
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What is set difference between recursive and recursively enumerable but not recursive?

All recursive Languages are recursively enumerable. But not all the recursively enumerable languages are recursive. It is just like NP complete.


What is Stephen reduction?

Stephen reduction is a method used in computability theory to show that a problem is undecidable by reducing a known undecidable problem to the problem in question. This technique was developed by J. Barry Stephen in the 1960s as a way to prove the undecidability of various problems in mathematics and computer science. By demonstrating that the known undecidable problem can be transformed into the new problem, it follows that the new problem is also undecidable.


Which technique can be applied to discover new undecidable problem?

Using computers as an example, just whack it a few times until lights flash. You might discover a new 'undecidable' problem.


What is meant by an undecidable context-free-language problem?

The following are undecidable cfl problems: If A is a cfl - Does A = Sigma star? If A & B cfls - is A a contained within B?


When you choose iterative or recursive algorithm?

If you cannot find any iterative algorithm for the problem, you have to settle for a recursive one.


What are the advantage and disadvantage of predicate logic?

Advantage:• Much more sophisticated than Source Language (SL). Can capture much (but not all) ofnatural language.Disadvantage:• Not decidable. In computability theory and computational complexity theory, an undecidable problem is a decision problem for which it is impossible to construct a single algorithm that always leads to a correct yes-or-no answer.A decision problem is any arbitrary yes-or-no question on an infinite set of inputs. Because of this, it is traditional to define the decision problem equivalently as the set of inputs for which the problem returns yes. These inputs can be natural numbers, but also other values of some other kind, such as strings of a formal language. Using some encoding, such as a Godel numbering, the strings can be encoded as natural numbers. Thus, a decision problem informally phrased in terms of a formal language is also equivalent to a set of natural numbers. To keep the formal definition simple, it is phrased in terms of subsets of the natural numbers.Formally, a decision problem is a subset of the natural numbers. The corresponding informal problem is that of deciding whether a given number is in the set. A decision problem A is called decidable or effectively solvable if A is a recursive set. A problem is called partially decidable, semi-decidable, solvable, or provable if A is a recursively enumerable set. Partially decidable problems and any other problems that are not decidable are called undecidable.


What is recursive association?

a recursive association - as a aggregation is a special form of association, so recursive aggregation can be called as recursive association ... AKASH SISODIYA ......IT ...


Why recursive and non-recursive delivers wrong result?

Recursive and non-recursive (also known as iterative) are simply two different approaches to solving a problem. Properly implemented, they should give the same result. If they do not, then something is wrong, and you should spend the time to figure out why.This is a generic answer, because the topic is too broad to answer here, as there are many different reasons that a particular algorithm may fail.


How can you solve the tower of hanoi?

1. Write mathematical analysis for recursive algorithms. Solve Tower of Hanoi Problem and analyze it.


Are all recursive programs non recursive?

None of them is, obviously.


What does the word recursive mean?

Something that is recursive is something that repeats.


What is the definition of recursive?

The term recursive refers to the recurrence or repetition.