A general first-order solution to the ramification problem with cycles

We provide a solution to the ramification problem that integrates findings of different axiomatic approaches to ramification from the last ten to fifteen years. For the first time, we present a solution that: (1) is independent of a particular time structure, (2) is formulated in classical first-ord...

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Bibliographic Details
Published in:Journal of applied logic 2013-09, Vol.11 (3), p.289-308
Main Authors: Strass, Hannes, Thielscher, Michael
Format: Article
Language:English
Subjects:
Activation
Axioms
Causality
Cyclic dependencies
Frames
Indirect effects
Laws
Logic
Mathematical models
Ramification problem
Reasoning about actions
Semantics
Sound
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Summary:We provide a solution to the ramification problem that integrates findings of different axiomatic approaches to ramification from the last ten to fifteen years. For the first time, we present a solution that: (1) is independent of a particular time structure, (2) is formulated in classical first-order logic, (3) treats cycles – a notoriously difficult aspect – properly, and (4) is assessed against a state-transition semantics via a formal correctness proof. This is achieved as follows: We introduce indirect effect laws that enable us to specify ramifications that are triggered by activation of a formula rather than just an atomic effect. We characterise the intended models of these indirect effect laws by a state-transition semantics. Afterwards, we show how to compile a class of indirect effect laws into first-order effect axioms that then solve the ramification and frame problems. We finally prove the resulting effect axioms sound and complete with respect to the semantics defined earlier.
ISSN:1570-8683
1570-8691
DOI:10.1016/j.jal.2013.05.003