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Posts Tagged "graph theory"

Roots of Unity

Wrong in Public: the 4-Color Theorem Edition

Wrong in Public is a new, hopefully very occasional, series on Roots of Unity. I don’t like being wrong in public, but sometimes I make a mistake in a post, and sometimes mistakes are interesting. In last Friday’s post on the 4-color theorem, I talked about some of the hypotheses of the theorem, including the [...]

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Roots of Unity

Having Fun with the 4-Color Theorem

The 4-color theorem is fairly famous in mathematics for a couple of reasons. First, it is easy to understand: any reasonable map on a plane or a sphere (in other words, any map of our world) can be colored in with four distinct colors, so that no two neighboring countries share a color. Second, computers [...]

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