We introduce ultrarings, which simultaneously generalize commutative rings and Boolean lextensive categories. As such, they allow to blend together standard algebraic notions (from commutative algebra) and logical notions (from categorical logic), providing a unifying descriptive framework in which complexity classes over arbitrary rings (as in the Blum, Schub, Smale model) and usual, Boolean complexity classes may be captured in a uniform way.
@InProceedings{chanus_et_al:LIPIcs.FSCD.2025.13, author = {Chanus, Baptiste and Mazza, Damiano and Rogers, Morgan}, title = {{Unifying Boolean and Algebraic Descriptive Complexity}}, booktitle = {10th International Conference on Formal Structures for Computation and Deduction (FSCD 2025)}, pages = {13:1--13:22}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-374-4}, ISSN = {1868-8969}, year = {2025}, volume = {337}, editor = {Fern\'{a}ndez, Maribel}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.FSCD.2025.13}, URN = {urn:nbn:de:0030-drops-236286}, doi = {10.4230/LIPIcs.FSCD.2025.13}, annote = {Keywords: Descriptive complexity theory, Categorical logic, Blum-Shub-Smale complexity} }
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