Constraint Logic Programming over Infinite Domains with an Application to Proof

Sebastian Krings
(Heinrich-Heine Universität Düsseldorf)
Michael Leuschel
(Heinrich-Heine Universität Düsseldorf)

We present a CLP(FD)-based constraint solver able to deal with unbounded domains. It is based on constraint propagation, resorting to enumeration if all other methods fail. An important aspect is detecting when enumeration was complete and if this has an impact on the soundness of the result. We present a technique which guarantees soundness in the following way: if the constraint solver finds a solution it is guaranteed to be correct; if the constraint solver fails to find a solution it can either return the result "definitely false" in case it knows enumeration was exhaustive, or "unknown" in case it was aborted. The technique can deal with nested universal and existential quantifiers. It can easily be extended to set comprehensions and other operators introducing new quantified variables. We show applications in data validation and proof.

In Sibylle Schwarz and Janis Voigtländer: Proceedings 29th and 30th Workshops on (Constraint) Logic Programming and 24th International Workshop on Functional and (Constraint) Logic Programming (WLP'15/'16/WFLP'16), Dresden and Leipzig, Germany, 22nd September 2015 and 12-14th September 2016, Electronic Proceedings in Theoretical Computer Science 234, pp. 73–87.
Published: 1st January 2017.

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