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- research-articleNovember 2019
Calculi for symmetric queries
Journal of Computer and System Sciences (JCSS), Volume 105, Issue CPages 54–86https://doi.org/10.1016/j.jcss.2019.04.003AbstractSymmetric queries are introduced as queries on a sequence of sets of objects the result of which does not depend on the order of the sets. An appropriate data model is proposed, and two query languages are introduced, ...
- research-articleOctober 2019
First-order definable counting-only queries
Annals of Mathematics and Artificial Intelligence (KLU-AMAI), Volume 87, Issue 1-2Pages 109–136https://doi.org/10.1007/s10472-019-09652-8AbstractMany data sources can be represented easily by collections of sets of objects. For several practical queries on such collections of sets of objects, the answer does not depend on the precise composition of these sets, but only on the number of ...