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We investigate the succinctness gap between two known equally-expressive and different linear-past extensions of standard CTL^* (resp., ATL^*). We establish by formal non-trivial arguments that the "memoryful" linear-past extension (the history leading to the current state is taken into account) can be exponentially more succinct than the standard "local" linear-past extension (the history leading to the current state is forgotten). As a second contribution, we consider the ATL-like fragment, denoted ATL_{lp}, of the known "memoryful" linear-past extension of ATL^{*}. We show that ATL_{lp} is strictly more expressive than ATL, and interestingly, it can be exponentially more succinct than the more expressive logic ATL^{*}. Moreover, we prove that both satisfiability and model-checking for the logic ATL_{lp} are Exptime-complete.
@InProceedings{bozzelli_et_al:LIPIcs.TIME.2018.6,
author = {Bozzelli, Laura and Murano, Aniello and Sorrentino, Loredana},
title = {{Results on Alternating-Time Temporal Logics with Linear Past}},
booktitle = {25th International Symposium on Temporal Representation and Reasoning (TIME 2018)},
pages = {6:1--6:22},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-089-7},
ISSN = {1868-8969},
year = {2018},
volume = {120},
editor = {Alechina, Natasha and N{\o}rv\r{a}g, Kjetil and Penczek, Wojciech},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.TIME.2018.6},
URN = {urn:nbn:de:0030-drops-97714},
doi = {10.4230/LIPIcs.TIME.2018.6},
annote = {Keywords: Alternating-time temporal logics, Linear Past, Model Checking}
}