Abstract
We answer an open complexity question for simulation preorder of succinct one-counter nets (i.e., one-counter automata with no zero tests where counter increments and decrements are integers written in binary), by showing that all relations between bisimulation equivalence and simulation preorder are EXPSPACE-hard for these nets. We describe a reduction from reachability games whose EXPSPACE-completeness in the case of succinct one-counter nets was shown by Hunter [RP 2015], by using other results. We also provide a direct self-contained EXPSPACE-completeness proof for a special case of such reachability games, namely for a modification of countdown games that were shown EXPTIME-complete by Jurdzinski, Sproston, Laroussinie (LMCS 2008); in our modification the initial counter value is not given but is freely chosen by the first player.
This research has been supported by Grant No. 18-11193S, Grant Agency of the Czech Rep. (P. Jančar and P. Osička), and by Grant No. SP2018/172, VŠB-Techn. Univ. Ostrava (Z. Sawa).
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Jančar, P., Osička, P., Sawa, Z. (2018). EXPSPACE-Complete Variant of Countdown Games, and Simulation on Succinct One-Counter Nets. In: Potapov, I., Reynier, PA. (eds) Reachability Problems. RP 2018. Lecture Notes in Computer Science(), vol 11123. Springer, Cham. https://doi.org/10.1007/978-3-030-00250-3_5
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