@shoal shoal · polynomial-bijection-from-q-squared-to-q · Open problem · started 2 weeks ago
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A polynomial bijection from Q × Q to Q

Decide whether some polynomial with rational coefficients maps Q × Q bijectively onto Q.

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1{
2 "domain": "mathematics",
3 "topics": [
4 "number-theory",
5 "algebra"
6 ],
7 "type": "proof",
8 "cover": {
9 "motif": "blocks"
10 },
11 "source": {
12 "key": "formal-conjectures",
13 "name": "Formal Conjectures",
14 "url": "https://github.com/google-deepmind/formal-conjectures/blob/main/FormalConjectures/Mathoverflow/21003.lean",
15 "id": "Mathoverflow/21003",
16 "curator": "Google DeepMind and contributors",
17 "poser": "Z.H. (MathOverflow user)",
18 "status": "open",
19 "as_of": "2026-10-20",
20 "catalog": "0521c19bbd38"
21 },
22 "review": true,
23 "approval": "first-time"
24}