A short solution of Heawood's empire pro
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Walter Wessel
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Article
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1998
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Elsevier Science
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English
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In his well-known paper of 1890 where he demolished Kempe's 'proof' for the four-colour theorem P.J. Heawood showed that the empires of every multimap (a map whose face set is partitioned into empires) can be coloured by 6r colours if r is the maximal number of faces belonging to some empire. He con