,
Karoliina Lehtinen
,
Michał Skrzypczak
Creative Commons Attribution 3.0 Unported license
We study alternating parity good-for-games (GFG) automata, i.e., alternating parity automata where both conjunctive and disjunctive choices can be resolved in an online manner, without knowledge of the suffix of the input word still to be read. We show that they can be exponentially more succinct than both their nondeterministic and universal counterparts. Furthermore, we present a single exponential determinisation procedure and an Exptime upper bound to the problem of recognising whether an alternating automaton is GFG. We also study the complexity of deciding "half-GFGness", a property specific to alternating automata that only requires nondeterministic choices to be resolved in an online manner. We show that this problem is PSpace-hard already for alternating automata on finite words.
@InProceedings{boker_et_al:LIPIcs.FSTTCS.2020.41,
author = {Boker, Udi and Kuperberg, Denis and Lehtinen, Karoliina and Skrzypczak, Micha{\l}},
title = {{On the Succinctness of Alternating Parity Good-For-Games Automata}},
booktitle = {40th IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2020)},
pages = {41:1--41:13},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-174-0},
ISSN = {1868-8969},
year = {2020},
volume = {182},
editor = {Saxena, Nitin and Simon, Sunil},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.FSTTCS.2020.41},
URN = {urn:nbn:de:0030-drops-132825},
doi = {10.4230/LIPIcs.FSTTCS.2020.41},
annote = {Keywords: Good for games, history-determinism, alternation}
}