# What Is A Tractable Problem?

## What does NP hard stand for?

non-deterministic polynomial-time hardnessIn computational complexity theory, NP-hardness (non-deterministic polynomial-time hardness) is the defining property of a class of problems that are informally “at least as hard as the hardest problems in NP”.

A simple example of an NP-hard problem is the subset sum problem..

## What is a tractable model?

A ‘tractable’ model is one that you can solve, which means there are several types of tractability : analytical tractability (finding a solution to a theoretical model), empirical tractability (being able to estimate/calibrate your model) and computational tractability (finding numerical solutions).

## What is complexity and tractability?

“Complexity is the time taken; tractability is a rule for deciding if the time is too long.

## What is the class of NP problems?

In computational complexity theory, NP (nondeterministic polynomial time) is a complexity class used to classify decision problems. NP is the set of decision problems for which the problem instances, where the answer is “yes”, have proofs verifiable in polynomial time by a deterministic Turing machine.

## What does not intractable mean in medical terms?

Although the two terms are often used simultaneously, a seizure (which is a single occurrence) is different than epilepsy (which is defined as two or more unprovoked seizures). The term intractable (or “uncontrolled” or “refractory to medication”) would only apply to patients with epilepsy or “seizure disorder”.

## Can a person be intractable?

When someone is tractable they are able to be managed or handled. When they are intractable, they are as unmanageable as a hungry two-year old.

## What is an intractable headache?

Published: June 27, 2016. Intractable headache is “doctor speak” for that headache that just doesn’t seem to go away, no matter what you and your doctor do. The headache may be migraine or another kind of headache, or a combination of two or more different headache types.

## What does intractable mean in medical terms?

Intractable pain refers to a type of pain that can’t be controlled with standard medical care. Intractable essentially means difficult to treat or manage. … If you have intractable pain, it’s constant and severe enough that you may need to be bedridden or hospitalized for care.

## What is the difference between P and NP?

P = the set of problems that are solvable in polynomial time by a Deterministic Turing Machine. NP = the set of decision problems (answer is either yes or no) that are solvable in nondeterministic polynomial time i.e can be solved in polynomial time by a Nondeterministic Turing Machine[4].

## What is NP completeness in algorithm?

(definition) Definition: The complexity class of decision problems for which answers can be checked for correctness, given a certificate, by an algorithm whose run time is polynomial in the size of the input (that is, it is NP) and no other NP problem is more than a polynomial factor harder.

## What is an intractable problem?

From a computational complexity stance, intractable problems are problems for which there exist no efficient algorithms to solve them. Most intractable problems have an algorithm – the same algorithm – that provides a solution, and that algorithm is the brute-force search.

## What do you mean by tractable algorithms?

So-called easy, or tractable, problems can be solved by computer algorithms that run in polynomial time; i.e., for a problem of size n, the time or number of steps needed to find the solution is a polynomial function of n. Algorithms for solving hard, or intractable, problems, on… In P versus NP problem.

## What are tractable and non tractable problems?

Tractable Problem: a problem that is solvable by a polynomial-time algorithm. … Intractable Problem: a problem that cannot be solved by a polynomial-time al- gorithm. The lower bound is exponential.

## What is p class in DAA?

P-Class. The class P consists of those problems that are solvable in polynomial time, i.e. these problems can be solved in time O(nk) in worst-case, where k is constant. These problems are called tractable, while others are called intractable or superpolynomial.

## What is considered polynomial time?

An algorithm is said to be solvable in polynomial time if the number of steps required to complete the algorithm for a given input is for some nonnegative integer , where is the complexity of the input.