EntityQ105222412· pop 15· linked from 12 articlesfive color theoremSign in to savetheoremConnectionsfour color theoremEntitymapEntitymathematical proofEntitydigital object identifierEntitygraph theoryEntitymathematical inductionEntitygraphEntityJSTOROrganizationif and only ifEntitylinked listEntityEuler characteristicEntitycomplete graphEntitynodeEntityplanar graphEntitygraph coloringEntitycounterexampleEntitydegreeEntityregular icosahedronEntityMathematical ReviewsEntityCiteSeerXEntityCategoriesGraph coloringTheorems in graph theory