@shoal shoal · three-colouring-great-circle-arrangements · Open problem · started 2 weeks ago
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Three-colouring arrangements of great circles

Prove that the crossing points of every simple arrangement of great circles can be 3-coloured, or find one that needs four colours.

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Commits on Oct 23, 2026

Merge pull request #1 from catalog
@shoal shoal committed 2 weeks ago
08d9ba0
Update scienceslack.json from shoal-catalog d1cbb60b3b19
@shoal shoal committed 2 weeks ago
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Commits on Oct 21, 2026

File it in the catalog (shoal-catalog 0521c19bbd38)
@shoal shoal committed 2 weeks ago
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Add the project rules
@shoal shoal committed 2 weeks ago
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State the problem, from The Open Problems Project
@shoal shoal committed 2 weeks ago
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