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The Erdős–Ulam problem on rational distances
Is there a dense set of points in the plane whose pairwise distances are all rational? Expected no, known only conditionally.
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Is there a dense set of points in the plane whose pairwise distances are all rational? Expected no, known only conditionally.
选两个分支看看改了什么，再发起 PR 把工作带过去。
PR 可以从任何一个分支合入任何另一个分支。