EntityQ745378· pop 9· linked from 50 articlesunit distance graphSign in to savenode-link graph of points in the plane, adjacent when their distance is exactly oneConnectionsgraphEntitygraph coloringEntityupper and lower boundsEntityAlexander SoiferEntityJournal of Combinatorial TheoryEntitymathematicsEntityInternational Standard Book NumberEntitycomplex numberEntitydigital object identifierEntityJohn Forbes NashEntityplaneEntityhexagonEntityPaul ErdősEntityabsolute valueEntityEuclidean spaceEntityJSTOREntitybibcodeEntityalgebraic numberEntityScienceEntityQ118398EntityCategoriesGeometric graphs