Journal of Applied Non-Classical Logics 14 (1-2):181-208 (2004)

Abstract
We generalise an interval-related interpolation theorem about abstract-time Interval Temporal Logic, which was first obtained in [GUE 01]. The generalisation is based on the abstract-time variant of a projection operator in the Duration Calculus, which was introduced in [DAN 99] and later studied extensively in [GUE 02]. We propose a way to understand interpolation in the context of formal verification. We give an example showing that, unlike abstract-time ITL, DC does not have the Craig interpolation property in general, and establish a special form of Craig interpolation for abstract-time DC. Explicit definability after Beth is known to be strongly related to Craig interpolation in general. We show a limitation of a different kind to the scope of Beth definability in ITL by a counterexample too. We call the generalisation of interval-related interpolation that we present projection-related interpolation. The DC-specific restrictions apply to it too. We show that both Craig and projection-related interpolation hold about the ⌈P⌉-subset of DC without such restrictions. Our proofs of these theorems for the ⌈P⌉-subset entail algorithms for the construction of the interpolants.
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DOI 10.3166/jancl.14.181-208
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References found in this work BETA

Model Theory.Gebhard Fuhrken - 1976 - Journal of Symbolic Logic 41 (3):697-699.
Interpolation for First Order S5.Melvin Fitting - 2002 - Journal of Symbolic Logic 67 (2):621-634.
Constructive Interpolation in Hybrid Logic.Patrick Blackburn & Maarten Marx - 2003 - Journal of Symbolic Logic 68 (2):463-480.

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