We study nested conditions, a generalization of first-order logic to a categorical setting, and provide a tableau-based (semi-decision) procedure for checking (un)satisfiability and finite model generation. This generalizes earlier results on graph conditions. Furthermore we introduce a notion of witnesses, allowing the detection of infinite models in some cases. To ensure completeness, paths in a tableau must be fair, where fairness requires that all parts of a condition are processed eventually. Since the correctness arguments are non-trivial, we rely on coinductive proof methods and up-to techniques that structure the arguments. We distinguish between two types of categories: categories where all sections are isomorphisms, allowing for a simpler tableau calculus that includes finite model generation; in categories where this requirement does not hold, model generation does not work, but we still obtain a sound and complete calculus.
@InProceedings{stoltenow_et_al:LIPIcs.CONCUR.2024.39, author = {Stoltenow, Lara and K\"{o}nig, Barbara and Schneider, Sven and Corradini, Andrea and Lambers, Leen and Orejas, Fernando}, title = {{Coinductive Techniques for Checking Satisfiability of Generalized Nested Conditions}}, booktitle = {35th International Conference on Concurrency Theory (CONCUR 2024)}, pages = {39:1--39:20}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-339-3}, ISSN = {1868-8969}, year = {2024}, volume = {311}, editor = {Majumdar, Rupak and Silva, Alexandra}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2024.39}, URN = {urn:nbn:de:0030-drops-208113}, doi = {10.4230/LIPIcs.CONCUR.2024.39}, annote = {Keywords: satisfiability, graph conditions, coinductive techniques, category theory} }
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