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Concept# UP (complexity)

Summary

In complexity theory, UP (unambiguous non-deterministic polynomial-time) is the complexity class of decision problems solvable in polynomial time on an unambiguous Turing machine with at most one accepting path for each input. UP contains P and is contained in NP.
A common reformulation of NP states that a language is in NP if and only if a given answer can be verified by a deterministic machine in polynomial time. Similarly, a language is in UP if a given answer can be verified in polynomial time, and the verifier machine only accepts at most one answer for each problem instance. More formally, a language L belongs to UP if there exists a two-input polynomial-time algorithm A and a constant c such that
:if x in L , then there exists a unique certificate y with |y| = O(|x|^c) such that A(x,y) = 1
:if x is not in L, there is no certificate y with |y| = O(|x|^c) such that A(x,y) = 1
:algorithm A verifies L in polynomial time.
UP (and its complement co-UP) co

Official source

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