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The maximum number of edges in a graph with fixed edge-degree

✍ Scribed by R.J. Faudree; J. Sheehan


Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
633 KB
Volume
183
Category
Article
ISSN
0012-365X

No coin nor oath required. For personal study only.

✦ Synopsis


Suppose that n i> 2t + 2 (t/> 17). Let G be a graph with n vertices such that its complement is connected and, for all distinct non-adjacent vertices u and v, there are at least t common neighbours. Then we prove that and

Furthermore, the results are sharp.


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## Abstract In 1968, Vizing [Uaspekhi Mat Nauk 23 (1968) 117–134; Russian Math Surveys 23 (1968), 125–142] conjectured that for any edge chromatic critical graph ${{G}} = ({{V}}, {{E}})$ with maximum degree $\Delta$, $|{{E}}| \geq {{{1}}\over {{2}}}\{(\Delta {{- 1}})|{{V}}| + {{3}}\}$. This conject