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  2. Polynomial hierarchy - Wikipedia

    en.wikipedia.org/wiki/Polynomial_hierarchy

    In computational complexity theory, the polynomial hierarchy (sometimes called the polynomial-time hierarchy) is a hierarchy of complexity classes that generalize the classes NP and co-NP. [1] Each class in the hierarchy is contained within PSPACE. The hierarchy can be defined using oracle machines or alternating Turing machines.

  3. Toda's theorem - Wikipedia

    en.wikipedia.org/wiki/Toda's_theorem

    The class P #P consists of all the problems that can be solved in polynomial time if you have access to instantaneous answers to any counting problem in #P (polynomial time relative to a #P oracle). Thus Toda's theorem implies that for any problem in the polynomial hierarchy there is a deterministic polynomial-time Turing reduction to a ...

  4. NP (complexity) - Wikipedia

    en.wikipedia.org/wiki/NP_(complexity)

    If there is a polynomial-time algorithm for even one of them, then there is a polynomial-time algorithm for all the problems in NP. Because of this, and because dedicated research has failed to find a polynomial algorithm for any NP-complete problem, once a problem has been proven to be NP-complete, this is widely regarded as a sign that a ...

  5. P versus NP problem - Wikipedia

    en.wikipedia.org/wiki/P_versus_NP_problem

    It runs in polynomial time on inputs that are in SUBSET-SUM if and only if P = NP: // Algorithm that accepts the NP-complete language SUBSET-SUM. // // this is a polynomial-time algorithm if and only if P = NP. // // "Polynomial-time" means it returns "yes" in polynomial time when // the answer should be "yes", and runs forever when it is "no".

  6. PH (complexity) - Wikipedia

    en.wikipedia.org/wiki/PH_(complexity)

    However, there is some evidence that BQP, the class of problems solvable in polynomial time by a quantum computer, is not contained in PH. [3] [4] P = NP if and only if P = PH. [5] This may simplify a potential proof of P ≠ NP, since it is only necessary to separate P from the more general class PH.

  7. NP-completeness - Wikipedia

    en.wikipedia.org/wiki/NP-completeness

    The NP-complete problems represent the hardest problems in NP. If some NP-complete problem has a polynomial time algorithm, all problems in NP do. The set of NP-complete problems is often denoted by NP-C or NPC. Although a solution to an NP-complete problem can be verified "quickly", there is no known way to find a solution quickly.

  8. ‘Connections’ Hints and Answers for NYT's Tricky Word Game on ...

    www.aol.com/connections-hints-answers-nyts...

    Get ready for all of the NYT 'Connections’ hints and answers for #245 on Sunday, February 11, 2024. Connections game for Sunday, February 11 , 2024 The New York Times

  9. PP (complexity) - Wikipedia

    en.wikipedia.org/wiki/PP_(complexity)

    M runs for polynomial time on all inputs; For all x in L, M outputs 1 with probability no less than 1/2; For all x not in L, M outputs 1 with probability strictly less than 1/2. Alternatively, PP can be defined using only deterministic Turing machines. A language L is in PP if and only if there exists a polynomial p and deterministic Turing ...