Displaying similar documents to “Simultaneous strategies and Boolean games of uncountable length”

Galvin Tree-Games

E. C. Milner (1985)

Publications du Département de mathématiques (Lyon)

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Club-guessing and non-structure of trees

Tapani Hyttinen (2001)

Fundamenta Mathematicae

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We study the possibilities of constructing, in ZFC without any additional assumptions, strongly equivalent non-isomorphic trees of regular power. For example, we show that there are non-isomorphic trees of power ω₂ and of height ω · ω such that for all α < ω₁· ω · ω, E has a winning strategy in the Ehrenfeucht-Fraïssé game of length α. The main tool is the notion of a club-guessing sequence.

Hercules versus Hidden Hydra Helper

Jiří Matoušek, Martin Loebl (1991)

Commentationes Mathematicae Universitatis Carolinae

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L. Kirby and J. Paris introduced the Hercules and Hydra game on rooted trees as a natural example of an undecidable statement in Peano Arithmetic. One can show that Hercules has a “short” strategy (he wins in a primitively recursive number of moves) and also a “long” strategy (the finiteness of the game cannot be proved in Peano Arithmetic). We investigate the conflict of the “short” and “long” intentions (a problem suggested by J. Nešetřil). After each move of Hercules (trying to kill...