Unifiability In Extensions Of K4
De Jongh, Dick
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We extend and generalize the work on unifiability of . We give a semantic characterization for unifiability and non-unifiability in the extensions of K4. We apply this in particular to extensions of KD4, GL and K4.3 to obtain a syntactic characterization and give a concrete decision procedure for unifiability for those logics. For that purpose we use universal models.