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The Modal Logic of Discrepancy

Charles B. Cross
Journal of Philosophical Logic
Vol. 26, No. 2 (Apr., 1997), pp. 143-168
Published by: Springer
Stable URL: http://www.jstor.org/stable/30226606
Page Count: 26
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The Modal Logic of Discrepancy
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Abstract

Discrepancies between an agent's goals and beliefs play an important, if implicit, role in determining what a rational agent is motivated to do. This is most obvious in cases where an agent achieves a complex goal incrementally and must deliberate anew as each milestone is reached. In such cases the concept of goal/belief discrepancy defines an appropriate space to which a degree-of-achievement yardstick can be applied. This paper presents soundness and completeness results concerning a logic for reasoning about goal/belief discrepancy, and it is suggested that a certain species of goal/belief discrepancy captures the concept of desire.

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