Model Construction for Modal Clauses

Author:

Hustadt UllrichORCID,Papacchini FabioORCID,Nalon CláudiaORCID,Dixon ClareORCID

Abstract

AbstractWe present deterministic model construction algorithms for sets of modal clauses saturated with respect to three refinements of the modal-layered resolution calculus implemented in the prover "Image missing". The model construction algorithms are inspired by the Bachmair-Ganzinger method for constructing a model for a set of ground first-order clauses saturated with respect to ordered resolution with selection. The challenge is that the inference rules of the modal-layered resolution calculus for modal operators are more restrictive than an adaptation of ordered resolution with selection for these would be. While these model construction algorithms provide an alternative means to proving completeness of the calculus, our main interest is the provision of a ‘certificate’ for satisfiable modal formulae that can be independently checked to assure a user that the result of "Image missing" is correct. This complements the existing provision of proofs for unsatisfiable modal formulae.

Publisher

Springer Nature Switzerland

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