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Polynomial Time Algorithm Solving the Refutation Tree Problem for Formal Graph Systems

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概要 The refutation tree problem for a formal graph system (FGS) is to compute a refutation tree which represents the logical structure of a graph generated by the FGS. We present three subclasses of FGSs:... simple FGSs, size-bounded simple FGSs, and bounded simple FGSs. We give a polynomial-time algorithm solving the refutation tree problem for simple FGSs. For sizebounded simple FGSs generating undirected trees of constantly bounded valence, we show that a refutation tree of a graph definable by the FGS can be computed in NC^2. Moreover, we indicate that the refutation tree problem for bounded simple FGSs is in NC^2.続きを見る

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登録日 2009.04.22
更新日 2020.10.22

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