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- Franz Baader, Carsten Lutz, Holger Sturm, Frank Wolter
- J. Artif. Intell. Res.
- 2002

Fusions are a simple way of combining logics. For normal modal logics, fusions have been investigated in detail. In particular, it is known that, under certain conditions, de-cidability transfers from the component logics to their fusion. Though description logics are closely related to modal logics, they are not necessarily normal. In addition, ABox… (More)

- Holger Sturm, Frank Wolter, Michael Zakharyaschev
- JELIA
- 2000

We consider the monodic formulas of common knowledge predicate logic, which allow applications of epistemic operators to formulas with at most one free variable. We provide nite axiomatizations of the monodic fragment of the most important common knowledge predicate logics (the full logics are known to be not recursively enumerable) and single out a number… (More)

Recent experiments on monkeys suggest that attention-related changes in the synchronous activity of neurones occur in the motor cortex. In humans, the clinical data available suggest that the weak synchronization of the motor unit firing observed during voluntary contraction might reflect the activity of the motoneurone cortico-spinal afferents. The present… (More)

- Oliver Kutz, Frank Wolter, Holger Sturm, Nobu-Yuki Suzuki, Michael Zakharyaschev
- ACM Trans. Comput. Log.
- 2003

We investigate the expressive power and computational properties of two different types of languages intended for speaking about distances. First, we consider a first-order language FM the two-variable fragment of which turns out to be undecidable in the class of distance spaces validating the triangular inequality as well as in the class of all metric… (More)

- Holger Sturm, Frank Wolter
- J. Log. Comput.
- 2002

In this paper we present a tableau calculus for a temporal extension of the description logic ALC, called T L ALC. This logic is based on the temporal language with`Until' interpreted over the natural numbers with expanding ALC-domains. The tableau calculus forms an elaborated combination of Wolper's tableau calculus for propositional linear temporal logic,… (More)

- Carsten Lutz, Holger Sturm, Frank Wolter, Michael Zakharyaschev
- IJCAR
- 2001

- Carsten Lutz, Holger Sturm, Frank Wolter, Michael Zakharyaschev
- Studia Logica
- 2002

The aim of this paper is to construct a tableau decision algorithm for the modal description logic KALC with constant domains. More precisely , we present a tableau procedure that is capable of deciding, given an ALC-formula ' with extra modal operators (which are applied only to concepts and TBox axioms, but not to roles), whether ' is satiss-able in a… (More)

- Franz Baader, Carsten Lutz, Holger Sturm, Frank Wolter
- Description Logics
- 2000

1 Motivation and outline In order to ensure a reasonable and predictable behaviour of a Description Logic (DL) system, reasoning in the DL employed by the system should at least be decidable, and preferably of low complexity. Consequently, the expressive power of the DL in question must be restricted in an appropriate way. If the imposed restrictions are… (More)

- Holger Sturm, Frank Wolter
- J. Philosophical Logic
- 2001