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Abstract

In this paper, the logic of acts of commanding ECL II introduced in Yamada (2007b) will be extended in order to model acts of promising together with acts of commanding. Effects of both kinds of acts are captured in terms, not of changes they bring about on propositional attitudes of their addressees, but of changes they bring about on deontic status of relevant action alternatives; they are modeled as deontic updators. This enables us to see how an act of promising performed by an agent and an act of commanding performed by another agent can jointly bring about a conflict of obligations. Complete axiomatization will be presented, and a comparison with Searle’s treatment of acts of promising in his argument for the derivability of “ought” from “is” will be made.

Keywords

Proof System Deontic Logic Constitutive Rule Special Obligation Dynamic Extension 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • Tomoyuki Yamada
    • 1
  1. 1.Division of Philosophy and Cultural SciencesGraduate School of Letters, Hokkaido UniversitySapporoJapan

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