Permissive strategies : from parity games to safety games
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 36 (2002) no. 3, pp. 261-275.

It is proposed to compare strategies in a parity game by comparing the sets of behaviours they allow. For such a game, there may be no winning strategy that encompasses all the behaviours of all winning strategies. It is shown, however, that there always exists a permissive strategy that encompasses all the behaviours of all memoryless strategies. An algorithm for finding such a permissive strategy is presented. Its complexity matches currently known upper bounds for the simpler problem of finding the set of winning positions in a parity game. The algorithm can be seen as a reduction of a parity to a safety game and computation of the set of winning positions in the resulting game.

DOI : 10.1051/ita:2002013
Classification : 68Q60, 68Q45, 91A50
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     author = {Bernet, Julien and Janin, David and Walukiewicz, Igor},
     title = {Permissive strategies : from parity games to safety games},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {261--275},
     publisher = {EDP-Sciences},
     volume = {36},
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     year = {2002},
     doi = {10.1051/ita:2002013},
     mrnumber = {1958243},
     zbl = {1090.91514},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/ita:2002013/}
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Bernet, Julien; Janin, David; Walukiewicz, Igor. Permissive strategies : from parity games to safety games. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 36 (2002) no. 3, pp. 261-275. doi : 10.1051/ita:2002013. http://archive.numdam.org/articles/10.1051/ita:2002013/

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