EntityQ2799491· pop 6· linked from 17 articlesRingel–Youngs theoremSign in to savetheorem on the number of colors needed for graphs embedded on higher genus surfacesConnectionssphereEntitymathematical proofEntitydigital object identifierEntityInternational Standard Serial NumberEntityplaneEntitygraph theoryEntitysurfaceEntityQ180686EntitytorusEntitybibcodeEntityfour color theoremEntityQ229883EntityconjectureEntityKlein bottleEntityEuler characteristicEntityOn-Line Encyclopedia of Integer SequencesEntitycomplete graphEntityMathWorldEntitygraph coloringEntityProceedings of the National Academy of Sciences of the United States of AmericaEntityCategoriesConjectures that have been provedGraph coloringTheorems in graph theoryTopological graph theory