How many colours are needed for a map? And for a plane?
When Francis Guthrie took on the task to colour a map of England in 1852 he needed four colours to ensure that no neighbouring shires had the same colour. Is this the case for any map imaginable, he wondered. As it turns out, five colours do suffice, as mathematically proven in 1890 in the … Continue reading How many colours are needed for a map? And for a plane?
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