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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.
Update from the catalog #1
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| @@ -22,5 +22,7 @@ | ||
| 22 | 22 | "status": "open", |
| 23 | 23 | "as_of": "2026-10-20", |
| 24 | 24 | "catalog": "0521c19bbd38" |
| 25 | - } | |
| 25 | + }, | |
| 26 | + "review": true, | |
| 27 | + "approval": "first-time" | |
| 26 | 28 | } |