A Modal Herbrand Theorem

@article{Fitting1996AMH,
  title={A Modal Herbrand Theorem},
  author={Melvin Fitting},
  journal={Fundam. Inform.},
  year={1996},
  volume={28},
  pages={101-122}
}
We state and prove a modal Herbrand theorem that is, we believe, a more natural analog of the classical version than has appeared before. The statement itself requires the enlargement of the usual machinery of first-order modal logic — we use the device of predicate abstraction, something that has been considered elsewhere as well. This expands the expressive power of modal logic in a natural way. Our proof of the modal version of Herbrand’s theorem uses a tableau system that takes predicate… CONTINUE READING

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