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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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1985_12_01_shrikhande_singhi: Shrikhande and Singhi (Combinatorica 1985) embed every large pairwise balanced design with blocks of size at least root n minus c in a projective plane; if every plane has prime power order the answer is no. Refereed.
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