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Issue title: Concurrency Specification and Programming Workshop (CS&P'2001)
Article type: Research Article
Authors: Varpaaniemi, Kimmo
Affiliations: Helsinki University of Technology, Laboratory for Theoretical Computer Science, P.O. Box 9700, FIN-02015 HUT, Finland
Abstract: Combinatorial explosion which occurs in parallel compositions of LTSs can be alleviated by letting the stubborn set method construct on-the-fly a reduced LTS that is CFFD- or CSP-equivalent to the actual parallel composition. This article considers the problem of minimizing the number of successor states of a given state in the reduced LTS. The problem can be solved by constructing an and/or-graph with weighted vertices and by finding a set of vertices that satisfies a certain constraint such that no set of vertices satisfying the constraint has a smaller sum of weights. Without weights, the and/or-graph can be constructed in low-degree polynomial time w.r.t. the length of the input of the problem. However, since actions can be nondeterministic and transitions can share target states, it is not known whether the weights are generally computable in polynomial time. Consequently, it is an open problem whether minimizing the number of successor states is as ``easy'' as minimizing the number of successor transitions.
Keywords: LTS's, CFFD-equivalence, CSP-equivalence, stubborn sets, and/or-graphs
Journal: Fundamenta Informaticae, vol. 51, no. 1-2, pp. 215-234, 2002
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