(Q2799491)
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Sitelinks
Wikipedia(6 entries)
- cawiki Conjectura de Heawood
- dewiki Satz von Ringel-Youngs
- enwiki Heawood conjecture
- frwiki Conjecture de Heawood
- ruwiki Гипотеза Хивуда
- zhwiki 曲面染色
theorem on the number of colors needed for graphs embedded on higher genus surfaces
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