- Source: Complete (complexity)
In computational complexity theory, a computational problem is complete for a complexity class if it is, in a technical sense, among the "hardest" (or "most expressive") problems in the complexity class.
More formally, a problem p is called hard for a complexity class C under a given type of reduction if there exists a reduction (of the given type) from any problem in C to p. If a problem is both hard for the class and a member of the class, it is complete for that class (for that type of reduction).
A problem that is complete for a class C is said to be C-complete, and the class of all problems complete for C is denoted C-complete. The first complete class to be defined and the most well known is NP-complete, a class that contains many difficult-to-solve problems that arise in practice. Similarly, a problem hard for a class C is called C-hard, e.g. NP-hard.
Normally, it is assumed that the reduction in question does not have higher computational complexity than the class itself. Therefore, it may be said that if a C-complete problem has a "computationally easy" solution, then all problems in "C" have an "easy" solution.
Generally, complexity classes that have a recursive enumeration have known complete problems, whereas classes that lack a recursive enumeration have none. For example, NP, co-NP, PLS, PPA all have known natural complete problems.
There are classes without complete problems. For example, Sipser showed that there is a language M such that BPPM (BPP with oracle M) has no complete problems.
References
Kata Kunci Pencarian:
- Ilmu komputer teoretis
- Teorema Cook
- Manusia
- Stephen Cook
- Max Nordau
- Makna kehidupan
- Alfred Russel Wallace
- Nigeria
- Astrobiologi
- Nicole Kidman
- Complete (complexity)
- Completeness
- Computational complexity theory
- NP-completeness
- NP (complexity)
- NL (complexity)
- Complexity
- Complexity class
- Time complexity
- Kolmogorov complexity
