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Planar graphs with neither 5-cycles nor close 3-cycles are 3-colorable

✍ Scribed by Oleg V. Borodin; Aleksei N. Glebov


Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
561 KB
Volume
66
Category
Article
ISSN
0364-9024

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Planar graphs without 4-cycles adjacent
✍ Oleg V. Borodin; Anna O. Ivanova 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 80 KB

## Abstract It is known that not all planar graphs are 4‐choosable; neither all of them are vertex 2‐arborable. However, planar graphs without 4‐cycles and even those without 4‐cycles adjacent to 3‐cycles are known to be 4‐choosable. We extend this last result in terms of covering the vertices of a