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First-order queries on classes of structures with bounded expansion

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arxiv 1802.04613 v4 pith:XNSLWOXA submitted 2018-02-13 cs.DB

classification cs.DB
keywords boundedexpansionfirst-orderlinearqueriestimeanswersclasses
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We consider the evaluation of first-order queries over classes of databases with bounded expansion. The notion of bounded expansion is fairly broad and generalizes bounded degree, bounded treewidth and exclusion of at least one minor. It was known that over a class of databases with bounded expansion, first-order sentences could be evaluated in time linear in the size of the database. We give a different proof of this result. Moreover, we show that answers to first-order queries can be enumerated with constant delay after a linear time preprocessing. We also show that counting the number of answers to a query can be done in time linear in the size of the database.

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  1. Triadic First-Order Logic Queries in Temporal Networks

    cs.DB 2025-07 conditional novelty 7.0 of 10

    FOLTY is the first algorithm for thresholded FOL triadic motif queries on temporal networks, with O(m α log σ_max) running time matching the best temporal triangle counters.

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