Do Repeat Yourself: Understanding Sufficient Conditions for Restricted Chase Non-Termination

Talk by Lukas Gerlach

Location: APB room 3027
Start: 27. July 2023 at 11:00 am
End: 27. July 2023 at 12:00 pm
Event series: Research Seminar Logic and AI
iCal

Abstract: The disjunctive restricted chase is a sound and complete procedure for solving boolean conjunctive query entailment over knowledge bases of disjunctive existential rules. Alas, this procedure does not always terminate and checking if it does is undecidable. However, we can use acyclicity notions (sufficient conditions that imply termination) to effectively apply the chase in many real-world cases. To know if these conditions are as general as possible, we can use cyclicity notions (sufficient conditions that imply non-termination). In this paper, we discuss some issues with previously existing cyclicity notions, propose some novel notions for non-termination by dismantling the original idea, and empirically verify the generality of the new criteria.

The talk will take place in a hybrid fashion, physically in the APB room 3027, and online through the link:

https://bbb.tu-dresden.de/b/pio-zwt-smp-aus