Beth Definability in Expressive Description Logics
Beth Definability in Expressive Description Logics
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表达描述逻辑中的 Beth 可定义性
DOI:
10.5591/978-1-57735-516-8/ijcai11-188
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发表时间:
2011
期刊:
影响因子:
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通讯作者:
Inanç Seylan
中科院分区:
文献类型:
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作者:
B. T. Cate;Enrico Franconi;Inanç Seylan
The Beth definability property, a well-known property from classical logic, is investigated in the context of description logics: if a general L-TBox implicitly defines an L-concept in terms of a given signature, where L is a description logic, then does there always exist over this signature an explicit definition in L for the concept? This property has been studied before and used to optimize reasoning in description logics. In this paper a complete classification of Beth definability is provided for extensions of the basic description logic ALC with transitive roles, inverse roles, role hierarchies, and/or functionality restrictions, both on arbitrary and on finite structures. Moreover, we present a tableau-based algorithm which computes explicit definitions of at most double exponential size. This algorithm is optimal because it is also shown that the smallest explicit definition of an implicitly defined concept may be double exponentially long in the size of the input TBox. Finally, if explicit definitions are allowed to be expressed in first-order logic, then we show how to compute them in single exponential time.
DOI:
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发表时间:
2010
期刊:
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影响因子:
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作者:
Boris Konev
通讯作者:
Boris Konev