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We consider trace automata. Their vertices are Mazurkiewicz traces and they accept finite words. Considering the length of a trace as the length of its Foata normal form, we define the operations of level-length synchronization and of superposition of trace automata. We show that if a family F of trace automata is closed under these operations, then for any deterministic automaton H in F, the word languages accepted by the deterministic automata of F that are length-reducible to H form a Boolean algebra. We show that the family of trace suffix automata with level-regular contexts and the subfamily of vector addition systems satisfy these closure properties. In particular, this yields various Boolean algebras of word languages accepted by deterministic vector addition systems.
@InProceedings{mansard:LIPIcs.FSTTCS.2019.48,
author = {Mansard, Alexandre},
title = {{Boolean Algebras from Trace Automata}},
booktitle = {39th IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2019)},
pages = {48:1--48:15},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-131-3},
ISSN = {1868-8969},
year = {2019},
volume = {150},
editor = {Chattopadhyay, Arkadev and Gastin, Paul},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.FSTTCS.2019.48},
URN = {urn:nbn:de:0030-drops-116107},
doi = {10.4230/LIPIcs.FSTTCS.2019.48},
annote = {Keywords: Boolean algebras, traces, automata, synchronization, pushdown automata, vector addition systems}
}