Journal of Philosophical Logic

, Volume 37, Issue 4, pp 387–406

ALTERNATIVE AXIOMATICS AND COMPLEXITY OF DELIBERATIVE STIT THEORIES

Authors

    • Institut de Recherche en Informatique de Toulouse (IRIT)
  • Andreas Herzig
    • Institut de Recherche en Informatique de Toulouse (IRIT)
  • Nicolas Troquard
    • Institut de Recherche en Informatique de Toulouse (IRIT)
Article

DOI: 10.1007/s10992-007-9078-7

Cite this article as:
Balbiani, P., Herzig, A. & Troquard, N. J Philos Logic (2008) 37: 387. doi:10.1007/s10992-007-9078-7

Abstract

We propose two alternatives to Xu’s axiomatization of Chellas’s STIT. The first one simplifies its presentation, and also provides an alternative axiomatization of the deliberative STIT. The second one starts from the idea that the historic necessity operator can be defined as an abbreviation of operators of agency, and can thus be eliminated from the logic of Chellas’s STIT. The second axiomatization also allows us to establish that the problem of deciding the satisfiability of a STIT formula without temporal operators is NP-complete in the single-agent case, and is NEXPTIME-complete in the multiagent case, both for the deliberative and Chellas’s STIT.

Key words

axiomatizationcomplexitylogic of agencySTIT

Copyright information

© Springer Science+Business Media B.V. 2007