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On the First-Order Expressibility of Recursive Queries

Summary: Establishes that for several syntactic fragments of Datalog, first-order (FO) expressibility over finite structures coincides with boundedness (equivalence to recursion-free Datalog). Consequences: FO-expressibility undecidable for binary programs, decidable for monadic ones, and Σ^0_2-complete in general (e.g., transitive closure/path is non-FO). (summarized by gpt-5-mini on Feb 09 2026)

Paper ID
876
Venue
PODS
Year
1989
Pagerank
4.702934e-05
Overall Rank
7,591 | 47.20%
DOI
-

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Rank Citing Paper Year Venue Pagerank
3,413 On the Complexity of Equivalence between Recursive and Nonrecursive Datalog Programs 1994 PODS 7.1240395e-05
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