A face 2-colourable triangulation of an orientable surface by a complete graph K n exists if and only if n#3 or 7 (mod 12). The existence of such triangulations follows from current graph constructions used in the proof of the Heawood conjecture. In this paper we give an alternative construction for
On the number of triangular embeddings of complete graphs and complete tripartite graphs
β Scribed by M. J. Grannell; M. Knor
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 159 KB
- Volume
- 69
- Category
- Article
- ISSN
- 0364-9024
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β¦ Synopsis
Abstract
We prove that for every prime number p and odd m>1, as sββ, there are at least w face 2βcolorable triangular embeddings of K~w, w, w~, where w = mΒ·p^s^. For both orientable and nonorientable embeddings, this result implies that for infinitely many infinite families of z, there is a constant c>0 for which there are at least z nonisomorphic face 2βcolorable triangular embeddings of K~z~. Β© 2011 Wiley Periodicals, Inc. J Graph Theory
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