Abstract
We prove that the second order predicate unification problem is undecidable by reducing the second order term unification problem to it.
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Amiot, G. The undecidability of the second order predicate unification problem. Arch Math Logic 30, 193–199 (1990). https://doi.org/10.1007/BF01621471
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DOI: https://doi.org/10.1007/BF01621471