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, while RP, ZPP, BPP and TFNP have no known complete problems (although such a problem may be discovered in the future).
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.