Naming worlds in modal and temporal logic

D. M. Gabbay, G. Malod

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


In this paper we suggest adding to predicate modal and temporal logic a locality predicate W which gives names to worlds (or time points). We also study an equal time predicate D(x, y) which states that two time points are at the same distance from the root. We provide the systems studied with complete axiomatizations and illustrate the expressive power gained for modal logic by simulating other logics. The completeness proofs rely on the fairly intuitive notion of a configuration in order to use a proof technique similar to a Henkin completion mixed with a tableau construction. The main elements of the completeness proofs are given for each case, while purely technical results are grouped in the appendix.

Original languageEnglish
Pages (from-to)29-65
Number of pages37
JournalJournal of Logic, Language and Information
Issue number1
StatePublished - 2002
Externally publishedYes


  • Hybrid logic
  • Modal logic
  • Nominals
  • Predicate logic
  • Temporal logic


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