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BP899 Regions in drawing (ignore background) can be coloured using three or fewer colours such that no adjacent regions are coloured the same colour vs. four colours are required.
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COMMENTS

This Problem is related to the four colour theorem.

CROSSREFS

Adjacent-numbered pages:
BP894 BP895 BP896 BP897 BP898  *  BP900 BP901 BP902 BP903 BP904

KEYWORD

hard, nice, math

CONCEPT separated_regions (info | search)

WORLD

[smaller | same | bigger]

AUTHOR

Jago Collins

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