License: Creative Commons Attribution 3.0 Unported license (CC BY 3.0)
When quoting this document, please refer to the following
DOI: 10.4230/LIPIcs.MFCS.2017.55
URN: urn:nbn:de:0030-drops-81203
Go to the corresponding LIPIcs Volume Portal

Chatterjee, Krishnendu ; Hansen, Kristoffer Arnsfelt ; Ibsen-Jensen, Rasmus

Strategy Complexity of Concurrent Safety Games

LIPIcs-MFCS-2017-55.pdf (0.5 MB)


We consider two player, zero-sum, finite-state concurrent reachability games, played for an infinite number of rounds, where in every round, each player simultaneously and independently of the other players chooses an action, whereafter the successor state is determined by a probability distribution given by the current state and the chosen actions. Player 1 wins iff a designated goal state is eventually visited. We are interested in the complexity of stationary strategies measured by their patience, which is defined as the inverse of the smallest non-zero probability employed. Our main results are as follows: We show that: (i) the optimal bound on the patience of optimal and epsilon-optimal strategies, for both players is doubly exponential; and (ii) even in games with a single non-absorbing state exponential (in the number of actions) patience is necessary.

BibTeX - Entry

  author =	{Krishnendu Chatterjee and Kristoffer Arnsfelt Hansen and Rasmus Ibsen-Jensen},
  title =	{{Strategy Complexity of Concurrent Safety Games}},
  booktitle =	{42nd International Symposium on Mathematical Foundations of Computer Science (MFCS 2017)},
  pages =	{55:1--55:13},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-046-0},
  ISSN =	{1868-8969},
  year =	{2017},
  volume =	{83},
  editor =	{Kim G. Larsen and Hans L. Bodlaender and Jean-Francois Raskin},
  publisher =	{Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{},
  URN =		{urn:nbn:de:0030-drops-81203},
  doi =		{10.4230/LIPIcs.MFCS.2017.55},
  annote =	{Keywords: Concurrent games, Reachability and safety, Patience of strategies}

Keywords: Concurrent games, Reachability and safety, Patience of strategies
Collection: 42nd International Symposium on Mathematical Foundations of Computer Science (MFCS 2017)
Issue Date: 2017
Date of publication: 01.12.2017

DROPS-Home | Fulltext Search | Imprint | Privacy Published by LZI