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arXiv cs/0407049cs.LOcs.AI
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有序逻辑程序的优选答案集

Preferred Answer Sets for Ordered Logic Programs

Davy Van Nieuwenborgh, Dirk Vermeir

摘要:

我们扩展答案集语义处理不一致的程序(包含经典否定),通过找到一个“最佳”的答案集。在不一致的程序中,规则的偏序是很自然的,表示满足某些规则的偏好,可能以违反不太重要的规则为代价。我们表明,这样的规则顺序诱导一个自然的顺序扩展的答案集,我们称之为首选答案集的最小元素。我们描述了所得到的语义的表达性,并表明它可以模拟否定失败,析取和其他一些形式主义,如逻辑程序有序析取。该方法被证明是有用的,在几个应用领域,例如修复数据库,其中最小的维修对应于首选的答案集。逻辑程序设计理论与实践(Theory and Practice of Logic Programming,TPLP)

英文摘要:

We extend answer set semantics to deal with inconsistent programs (containing classical negation), by finding a ``best'' answer set. Within the context of inconsistent programs, it is natural to have a partial order on rules, representing a preference for satisfying certain rules, possibly at the cost of violating less important ones. We show that such a rule order induces a natural order on extended answer sets, the minimal elements of which we call preferred answer sets. We characterize the expressiveness of the resulting semantics and show that it can simulate negation as failure, disjunction and some other formalisms such as logic programs with ordered disjunction. The approach is shown to be useful in several application areas, e.g. repairing database, where minimal repairs correspond to preferred answer sets. To appear in Theory and Practice of Logic Programming (TPLP).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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