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An Infinitely Colorable Set of 3D Regions
Suppose that if two regions touch, then they should have different colors. How many colors suffice? In the plane, four colors are sufficient. In 3D, the set of regions shown requires an infinite number of colors.
Contributed by:
Jon Perry
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Four-Color Theorem
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An Infinitely Colorable Set of 3D Regions
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http://demonstrations.wolfram.com/AnInfinitelyColorableSetOf3DRegions/
Contributed by:
Jon Perry
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