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Intractable may refer to: Intractable conflict, a form of complex, severe, and enduring conflict; Intractable pain, pain which cannot be controlled/cured by any known ...
The answer is not known, but it is believed that the problem is at least not NP-complete. [8] If graph isomorphism is NP-complete, the polynomial time hierarchy collapses to its second level. [9] Since it is widely believed that the polynomial hierarchy does not collapse to any finite level, it is believed that graph isomorphism is not NP-complete.
The errors are believed to make the problem intractable (for appropriate parameters); in particular, there are known worst-case to average-case reductions from variants of SVP. [12] For quantum computers, Factoring and Discrete Log problems are easy, but lattice problems are conjectured to be hard. [13]
In computational complexity theory, Karp's 21 NP-complete problems are a set of computational problems which are NP-complete.In his 1972 paper, "Reducibility Among Combinatorial Problems", [1] Richard Karp used Stephen Cook's 1971 theorem that the boolean satisfiability problem is NP-complete [2] (also called the Cook-Levin theorem) to show that there is a polynomial time many-one reduction ...
Adding one more piece to a chess ending (thus making an 8-piece tablebase) is considered intractable due to the added combinatorial complexity. [ 6 ] [ 7 ] Furthermore, the prospect of solving larger chess-like games becomes more difficult as the board-size is increased, such as in large chess variants , and infinite chess .
Intractable pain, also called intractable pain syndrome (IPS), is a severe, constant, relentless, and debilitating pain that is not curable by any known means and which causes a house-bound or bed-bound state and early death if not adequately treated, usually with opioids and/or interventional procedures. It is not relieved by ordinary medical ...
Just in case anyone passed by, I frowned at my screen as though solving an intractable problem. When it was time for the meeting, I strode in with an air of slightly harried purpose, lest anyone ...
The W hierarchy is a collection of computational complexity classes. A parameterized problem is in the class W[i], if every instance (,) can be transformed (in fpt-time) to a combinatorial circuit that has weft at most i, such that (,) if and only if there is a satisfying assignment to the inputs that assigns 1 to exactly k inputs.