P. M. van Lambalgen

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We present the Cyclic Zipper Method, a procedure to construct lower bounds for Van der Waerden numbers. Using this method we improved seven lower bounds. For natural numbers r, k and n a Van der Waerden certificate W (r, k, n) is a partition of {1,. .. , n} into r subsets, such that none of them contains an arithmetic progression of length k (or larger).(More)
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