Abstract
The logicD-J of the weak exluded middle with constant domains is proved to be incomplete with respect to Kripke semantics, by introducing models in presheaves on an arbitrary category. Additional incompleteness results are obtained for the modal systems with nested domains extendingQ-S4.1.
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Ghilardi, S. Presheaf semantics and independence results for some non-classical first-order logics. Arch Math Logic 29, 125–136 (1989). https://doi.org/10.1007/BF01620621
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DOI: https://doi.org/10.1007/BF01620621