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Research notes on every problem, and a library of the papers behind them. Built from the open erdos repository.

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1975_11_01_spencer: Theorem 1 of Spencer's 1975 paper in J. Combin. Theory Ser. A: for every k and c there is a finite set of integers with no (k+1)-term arithmetic progression, every c-coloring of which has a monochromatic k-term one.