The complexity of predicate default logic over a countable domain

Annals of Pure and Applied Logic 120 (1-3):151-163 (2003)
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Abstract

Lifschitz introduced the notion of defining extensions of predicate default theories not as absolute, but relative to a specified domain. We look specifically at default theories over a countable domain and show the set of default theories which possess an ω -extension is Σ 2 1 -complete. That the set is in Σ 2 1 is shown by writing a nearly circumscriptive formula whose ω -models correspond to the ω -extensions of a given default theory; similarly, Σ 2 1 -hardness is established by a method for translating formulas into default theories in such a way that ω -models of the circumscriptive formula correspond to ω -extensions of the default theory

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References found in this work

A logic for default reasoning.Ray Reiter - 1980 - Artificial Intelligence 13 (1-2):81-137.
Circumscription — A Form of Non-Monotonic Reasoning.John McCarthy - 1980 - Artificial Intelligence 13 (1-2):27–39.
Non-monotonic logic I.Drew McDermott & Jon Doyle - 1980 - Artificial Intelligence 13 (1-2):41-72.
A logic of knowledge and justified assumptions.Fangzhen Lin & Yoav Shoham - 1992 - Artificial Intelligence 57 (2-3):271-289.
A comparative study of open default theories.Michael Kaminski - 1995 - Artificial Intelligence 77 (2):285-319.

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