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03/20/2023
Counting Homomorphisms from Hypergraphs of Bounded Generalised Hypertree Width: A Logical Characterisation
We introduce the 2-sorted counting logic GC^k that expresses properties ...
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01/25/2021
Spanner Evaluation over SLP-Compressed Documents
We consider the problem of evaluating regular spanners over compressed d...
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10/26/2020
A Purely Regular Approach to Non-Regular Core Spanners
The regular spanners (characterised by vset-automata) are closed under t...
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10/16/2020
Enumerating Answers to First-Order Queries over Databases of Low Degree
A class of relational databases has low degree if for all δ>0, all but f...
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09/22/2020
Learning Concepts Described by Weight Aggregation Logic
We consider weighted structures, which extend ordinary relational struct...
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03/02/2020
Constant delay enumeration with FPT-preprocessing for conjunctive queries of bounded submodular width
Marx (STOC 2010, J. ACM 2013) introduced the notion of submodular width ...
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12/23/2019
Answering (Unions of) Conjunctive Queries using Random Access and Random-Order Enumeration
As data analytics becomes more crucial to digital systems, so grows the ...
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09/28/2017
Answering UCQs under updates and in the presence of integrity constraints
We investigate the query evaluation problem for fixed queries over fully...
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07/19/2017