An Essay on Unification and Inference Rules for Modal Logics

@inproceedings{Rybakov2007AnEO,
  title={An Essay on Unification and Inference Rules for Modal Logics},
  author={Vladimir V. Rybakov and Mehmet Terziler and Cevriye Gencer},
  year={2007}
}
We study unification of formulas in modal logics and consider logics which are equivalent w.r.t. unification of formulas. A criterium is given for equivalence w.r.t. unification via existence or persistent formulas. A complete syntactic description of all formulas which are non-unifiable in wide classes of modal logics is given. Passive inference rules are considered, it is shown that in any modal logic over S4 there is a finite basis for passive rules. 

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