Kuratowski-Type Theorems for Average Genus
β Scribed by J. Chen; J.L. Gross
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 767 KB
- Volume
- 57
- Category
- Article
- ISSN
- 0095-8956
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β¦ Synopsis
Graphs of small average genus are characterized. In particular, a Kuratowskitype theorem is obtained: except for finitely many graphs, a cutedge-free graph has average genus less than or equal to (t) if and only if it is a necklace. We provide a complete list of those exceptions. A Kuratowski-type theorem for graphs of maximum genus 1 is also given. Some of the methods used in obtaining these results involve variations of a classical result of Whitney. 1993 Academic Press. Inc.
π SIMILAR VOLUMES
Two lower bounds are obtained for the average genus of graphs. The average genus for a graph of maximum valence at most 3 is at least half its maximum genus, and the average genus for a 2-connected simplicial graph other than a cycle is at least 1/16 of its cycle rank.