Abstract
A tabled logic programming (TLP) system can be thought of as an engine for efficiently computing fixed points. In a TLP system, a global data structure table is introduced to memorize the answers of any subgoals to tabled predicates, whose purpose is to never do the same computation twice. Consider the tabled predicate reach/2 defined as follows for the reachability relation. Given a query reach(a,X), a TLP system returns answers X=b, X=c and X=a, albeit the predicate is defined left-recursively.
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