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arXiv · 2607.05336

Someone slept in my bed! On the entailment problem for conjunctive queries with safe negation over DL-Lite$_{core}$ knowledge bases

Jerzy Marcinkowski·Piotr Ostropolski-Nalewaja
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Abstract

We solve a long standing open problem, showing that the query answering for conjunctive queries with safe negation, over DL-Lite$_{core}$ knowledge bases, is undecidable.

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Jerzy Marcinkowski, Piotr Ostropolski-Nalewaja. 2026-07-06. Someone slept in my bed! On the entailment problem for conjunctive queries with safe negation over DL-Lite$_{core}$ knowledge bases. https://arxiv.org/abs/2607.05336

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