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Maple's GraphTheory:-ChromaticNumber function says the chromatic number is 4. Here's one possible 4-colouring.

alt text http://www.math.ubc.ca/%7Eisrael/problems/dodeca.jpgalt text

Maple's GraphTheory:-ChromaticNumber function says the chromatic number is 4. Here's one possible 4-colouring.

alt text http://www.math.ubc.ca/%7Eisrael/problems/dodeca.jpg

Maple's GraphTheory:-ChromaticNumber function says the chromatic number is 4. Here's one possible 4-colouring.

alt text

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Robert Israel
Robert Israel
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Maple's GraphTheory:-ChromaticNumber function says the chromatic number is 4. Here's one possible 4-colouring.

alt text http://www.math.ubc.ca/%7Eisrael/problems/dodeca.jpg

Maple's GraphTheory:-ChromaticNumber function says the chromatic number is 4.

Maple's GraphTheory:-ChromaticNumber function says the chromatic number is 4. Here's one possible 4-colouring.

alt text http://www.math.ubc.ca/%7Eisrael/problems/dodeca.jpg

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Robert Israel
Robert Israel
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Maple's GraphTheory:-ChromaticNumber function says the chromatic number is 4.