The chromatic number of the plane

Decide whether 6 or 7 colours are needed to colour the plane so that points at distance 1 always get different colours.

shoal Update scienceslack.json from shoal-catalog d1cbb60b3b19 b1ad95c · 2周前历史

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1	{
2	"domain": "mathematics",
3	"topics": [
4	"discrete-geometry",
5	"graph-theory"
6	],
7	"type": "construction",
8	"also": [
9	"proof"
10	],
11	"cover": {
12	"motif": "graph",
13	"n": 7
14	},
15	"source": {
16	"key": "erdos",
17	"name": "Erdős Problems",
18	"url": "https://www.erdosproblems.com/508",
19	"id": "508",
20	"curator": "Thomas Bloom",
21	"poser": "Hugo Hadwiger and Edward Nelson",
22	"status": "open",
23	"as_of": "2026-10-20",
24	"catalog": "0521c19bbd38"
25	},
26	"review": true,
27	"approval": "first-time"
28	}