A new form of the four-vertex theorem
β Scribed by W. C. Graustein
- Publisher
- Springer Vienna
- Year
- 1936
- Tongue
- English
- Weight
- 168 KB
- Volume
- 43
- Category
- Article
- ISSN
- 0026-9255
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
Lawrence [2, Theorem 3] and Borodin and Kostochka [1, Lemma 2' 1 both give the same theorem about vertex colorings of graphs (Corollary 1 below). But Lawrence's proof, although powerful, is a little long, and Borodin and Kostoehka state the result without a proof.
## Abstract A major event in 1976 was the announcement that the Four Color Conjecture (4CC) had at long last become the Four Color Theorem (4CT). The proof by W. Haken, K. Appel, and J. Koch is published in the __Illinois Journal of Mathematics__, and their twoβpart article outlines the nature and