Abstract
We consider the fuzzy description logic \({\mathcal {ALCOI}}\) with semantics based on a finite residuated De Morgan lattice. We show that reasoning in this logic is ExpTime-complete w.r.t. general TBoxes. In the sublogics \({\mathcal {ALCI}}\) and \({\mathcal {ALCO}}\), it is PSpace-complete w.r.t. acyclic TBoxes. This matches the known complexity bounds for reasoning in classical description logics between \({\mathcal ALC} \) and \({\mathcal {ALCOI}}\).
Partially supported by the DFG under grant BA 1122/17-1, in the research training group 1763 (QuantLA), and in the Cluster of Excellence ‘cfAED’.
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Notes
- 1.
The paper [18] considers the fuzzy modal logic K, which can be seen as a syntactic variant of fuzzy \({\mathcal ALC} \) with only one role.
- 2.
We do not consider mixed TBoxes. We could allow axioms of the form \({\langle A\sqsubseteq C\ge \ell \rangle } \) in acyclic TBoxes, as long as they do not introduce cyclic dependencies. To avoid overloading the notation, we exclude this case.
- 3.
This method, called lazy unfolding, is only correct for acyclic TBoxes.
- 4.
There is at most one such predecessor, namely the parent node.
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Borgwardt, S., Peñaloza, R. (2014). Finite Lattices Do Not Make Reasoning in \({\mathcal {ALCOI}}\) Harder. In: Bobillo, F., et al. Uncertainty Reasoning for the Semantic Web III. URSW URSW URSW 2012 2011 2013. Lecture Notes in Computer Science(), vol 8816. Springer, Cham. https://doi.org/10.1007/978-3-319-13413-0_7
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