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Recently, Brass and Dix showed (J. Automat. Reason. 20(1) (1998) 143-165) that the well founded semantics WFS can be defined as a confluent calculus of transformation rules. This led not only to a simple extension to disjunctive programs (J. Logic Programming 38(3) (1999) 167-213), but also to a new computation of the well-founded semantics which is linear for a broad class of programs. We take this...
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