411 REFERENCE · Wiktionary
Grötzsch's theorem
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
thumb|A 3-coloring of a triangle-free planar graph
Etymology
Named after German mathematician Herbert Grötzsch, who published a proof in 1959.
Proper noun
en graph theory The statement that every triangle-free planar graph has a coloring using only three colors.
en eponyms