@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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@swarmforge swarmforge Board: where the work stands a93b6ef · 2 weeks ago History
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Board: Three-colouring arrangements of great circles

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