Computing the JTH solution of a first-order query
Résumé
We design algorithms of "optimal" data complexity for several natural problems about first-order queries on structures of bounded degree. For that purpose, we first introduce a framework to deal with logical or combinatorial problems R ⊂ I × O whose instances x 2 I may admit of several solutions R(x) = {y 2 O : (x, y) 2 R}.
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