login
Hints
(Greetings from The On-Line Encyclopedia of Bongard Problems!)
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.
(edit; present; nest [left/right]; search; history)
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

Welcome | Solve | Browse | Lookup | Recent | Links | Register | Contact
Contribute | Keywords | Concepts | Worlds | Ambiguities | Transformations | Invalid Problems | Style Guide | Goals | Glossary