Download e-book for kindle: Logic, Language, Information and Computation: 16th by Arnold Beckmann (auth.), Hiroakira Ono, Makoto Kanazawa, Ruy

By Arnold Beckmann (auth.), Hiroakira Ono, Makoto Kanazawa, Ruy de Queiroz (eds.)

ISBN-10: 364202260X

ISBN-13: 9783642022609

Edited in collaboration with FoLLI, the organization of good judgment, Language and data, this ebook constitutes the 4th quantity of the FoLLI LNAI subline; containing the refereed court cases of the 16h foreign Workshop on good judgment, Language, details and Computation, WoLLIC 2009, held in Tokyo, Japan, in June 2009.

The 25 revised complete papers awarded including six tutorials and invited talks have been rigorously reviewed and chosen from fifty seven submissions. The papers hide the most lively components of study at the frontiers among computation, good judgment, and linguistics, with specific curiosity in cross-disciplinary issues. regular parts of curiosity are: foundations of computing and programming; novel computation versions and paradigms; huge notions of facts and trust; formal equipment in software program and improvement; logical method of average language and reasoning; logics of courses, activities and assets; foundational points of knowledge association, seek, circulate, sharing, and protection.

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Additional resources for Logic, Language, Information and Computation: 16th International Workshop, WoLLIC 2009, Tokyo, Japan, June 21-24, 2009. Proceedings

Sample text

The above just mimics the conditions in Proposition 2. We now define global conditions to ensure that the marking is consistent between knots. Definition 7 (Coherency of marked knot sets). For a set K of Q-marked knots, we call (τ, S, ν) ∈ K good in K if for each (ρ, τ ) ∈ S, there is some (τs , Ss , νs ) ∈ K such that τ = τs and ν((ρ, τ )) = νs ( ). Then K is K-coherent if for each (τ, S, ν) ∈ K, (τ, S) is K-consistent and (τ, S, ν) is Q-avoiding and good in K. To show the following, we can now argue as for Theorem 1, additionally using Proposition 2.

Summing up, in this paper we have illustrated how the knot technique can be applied for answering conjunctive queries in DLs. The method is conceptually simple yet powerful enough to handle different DLs with considerably different computational properties. To wit, we presented a worst-case optimal algorithm that directly scales from the DL ALCH to the exponentially harder DL ALCHI. Given that knots are special mosaics tailored for DLs with tree-shaped models, investigating the mosaic technique for query answering in more expressive DLs which lack this property, like (fragments of) SHOIQ and SROIQ, is an interesting topic for future research.

Wolter In mathematical logic, L is typically first-order logic (FO) or some language that extends FO. Every model-theoretic conservative extension is an FO-conservative extension, but the converse is well-known to fail. Both notions can, in principle, be used without modification to analyse the effect of adding axioms T to a given ontology T . It tuns out, however, that the corresponding decision problem “decide whether T ∪ T is a conservative extension of T ” is undecidable for theories T and T formulated in EL, ALC, and OWL-DL, both for modelconservative extensions and FO-conservative extensions [19,18].

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Logic, Language, Information and Computation: 16th International Workshop, WoLLIC 2009, Tokyo, Japan, June 21-24, 2009. Proceedings by Arnold Beckmann (auth.), Hiroakira Ono, Makoto Kanazawa, Ruy de Queiroz (eds.)

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