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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.
PR
PR 把工作从一条路线带到另一条；合并它就是采纳。
新建 PR
Decide whether 6 or 7 colours are needed to colour the plane so that points at distance 1 always get different colours.
PR 把工作从一条路线带到另一条；合并它就是采纳。