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On Angles and Perturbations of Graphs

✍ Scribed by Rowlinson, P.

Book ID
120092542
Publisher
Oxford University Press
Year
1988
Tongue
English
Weight
111 KB
Volume
20
Category
Article
ISSN
0024-6093

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A well-known theorem of Heawood states that 3-edge-coloring bridgeless planar cubic graphs-and, hence, the four-color theorem-is equivalent to labeling vertices with either +1 or -1 so that the sum around any face is 0 (mod 3). In this paper we introduce the notion of "angle-labeling" and give resul