In proof planning mathematical objects with theory-specific properties have to be constructed. More often than not, mere unification offers little support for this task. However, the integration of constraint solvers into proof planning can sometimes help solving this problem. We present such an integration and discover certain requirements to be met in order to integrate the constraint solver's efficient activities in a way that is correct and sufficient for proof planning. We explain how the requirements can be met by an extension of the constraint solving technology and describe their implementation in the constraint solver CoSIE.
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