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• W109561861 abstract "Intractable problems are hard to solve. Since the work “has to be done”, various solutions have been developed. The two classical ones are the language restriction and the approximation. The first solution is to admit input strings only if they have a certain form. The second one is to find a solution that can be sometimes incorrect. In this dissertation we concentrate on compilation. The basic scenario is the following one: we have an intractable problem, thus a problem for which it is believed no polynomial algorithm exists. However, each instance of this problem is composed of two parts, one (called the fixed part is known in advance, while the other (called the varying part) only comes at execution time. Our idea is to solve the problem in two steps: 1. Take the fixed part and compile it into a new data structure; 2. Take the new data structure and the varying part, and produce the output. If the second step can be accomplished in polynomial time, the problem is said to be compilable to polynomial time, that is, after a preprocessing, the cost of solving it is only polynomial. The dissertation contains a formal definition of compilation and compilability of hard problems. Namely, two hierarchies of classes of problems (similar to the polynomial hierarchy) are defined. One of them is used to prove that problems are compilable, while the other one is mainly used to prove that some problems are not compilable. Applications of this framework includes: compilability of AI problems, problems on graphs, compact representation of AI operators. A comparison with the non-uniform polynomial hierarchy and with the FPT classes are given." @default.
• W109561861 created "2016-06-24" @default.
• W109561861 creator A5008581096 @default.
• W109561861 date "2004-01-01" @default.
• W109561861 modified "2023-09-27" @default.
• W109561861 title "Compilation of Intractable Problems and Its Application to Artificial Intelligence" @default.
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• W109561861 hasPublicationYear "2004" @default.
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