Inter-universal geometry と ABC予想 (応援スレ) 74 (892ﾚｽ)
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92(1): 現代数学の系譜 雑談 ◆yH25M02vWFhP 08/23(土)23:44 ID:KYsCHIBD(16/17) AAS
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A similar result, but now without using the Axiom of Choice.2 Consider the following two-person game game2: • Player 1 chooses a rational number in the interval [0,1] and writes down its infinite decimal expansion 0.x1x2...xn..., with all xn ∈ {0,1,...,9}. • Player 2 asks (in some order) what are the digits xn except one, say xi; then he writes down a digit ξ ∈ {0,1,...,9}. • If xi = ξ then Player 2 wins, and if xi= ξ then Player 1 wins. By choosing i arbitrarily and ξ uniformly in {0,1,...,9}, Player 2 can guarantee a win with probability 1/10. However, we have: Theorem 2 For every ε > 0 Player 2 has a mixed strategy in game2 guaranteeing him a win with probability at least 1 − ε.

Remark. When the number of boxes is finite Player 1 can guarantee a win
with probability 1 in game1, and with probability 9/10 in game2, by choosing
the xi independently and uniformly on [0, 1] and {0, 1,..., 9}, respectively.
(引用終り)
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