Van der waerden and ramsey type games |
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Authors: | József Beck |
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Institution: | (1) Mathematical Institute of the Hungarian Academy of Sciences, H-1053 Budapest, Hungary |
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Abstract: | Let us consider the following 2-player game, calledvan der Waerden game. The players alternately pick previously unpicked integers of the interval {1, 2, ...,N}. The first player wins if he has selected all members of ann-term arithmetic progression. LetW*(n) be the least integerN so that the first player has a winning strategy.
By theRamsey game on k-tuples we shall mean a 2-player game where the players alternately pick previously unpicked elements of the completek-uniform hypergraph ofN verticesK
N
k
, and the first player wins if he has selected allk-tuples of ann-set. LetR
k*(n) be the least integerN so that the first player has a winning strategy.
We prove (W* (n))1/n → 2,R
2*(n)<(2+ε)
n
andR
k
*
n<2
nk
/
k!
fork ≧3. |
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Keywords: | 05 A 05 |
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