🌐EnglishEnglishDeutschFrançaisTürkçeРусскийEntityQ5612871· pop 6· linked from 11 articlesGrötzsch's theoremtheorem that every triangle-free planar graph is 3-colorableWikidata factsImageGroetsch-3-coloring.svgvia Wikidata · CC0Available in 6 languagesFrançaisDeutschРусскийHungarianUkrainianvia Wikidata sitelinks · CC0ConnectionsmathematicsEntityInternational Standard Book NumberEntityCategoriesGraph coloringStatements about planar graphsTheorems in graph theory