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Grün’s theorems and class groups

✍ Scribed by Franz Lemmermeyer

Publisher
Springer
Year
2010
Tongue
English
Weight
123 KB
Volume
96
Category
Article
ISSN
0003-889X

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📜 SIMILAR VOLUMES

A new proof of Grünbaum's 3 color theore
A new proof of Grünbaum's 3 color theorem
✍ O.V. Borodin 📂 Article 📅 1997 🏛 Elsevier Science 🌐 English ⚖ 307 KB

A simple proof of Grfinbaum's theorem on the 3-colourability of planar graphs having at most three 3-cycles is given, which does not employ the colouring extension. In 1958, Gr6tzsch I-5] proved that every planar graph without cycles of length three is 3-colourable. In 1963, Griinbaum [6] extended