## Abstract

Proof planning is an application of AI planning to theorem proving that employs plan operators that encapsulate mathematical proof techniques. Many proofs require the instantiation of variables; that is, mathematical objects with certain properties have to be constructed. This is particularly difficult for automated theorem provers if the instantiations have to satisfy requirements specific for a mathematical theory, for example, for finite sets or for real numbers, because in this case unification is insufficient for finding a proper instantiation. Often, constraint solving can be employed for this task. We describe a framework for the integration of constraint solving into proof planning that combines proof planners and stand-alone constraint solvers. Proof planning has some peculiar requirements that are not met by any off-the-shelf constraint-solving system. Therefore, we extended an existing propagation-based constraint solver in a generic way. This approach generalizes previous work on tackling the problem. It provides a more principled way and employs existing AI technology.

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Zimmer, J., Melis, E. Constraint Solving for Proof Planning.
*J Autom Reasoning* **33**, 51–88 (2004). https://doi.org/10.1007/s10817-004-2725-6

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DOI: https://doi.org/10.1007/s10817-004-2725-6

### Keywords

- automated reasoning
- proof plans
- constraint satisfaction