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The chromatic index of graphs of even order with many edges

✍ Scribed by A. G. Chetwynd; A. J. W. Hilton


Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
313 KB
Volume
8
Category
Article
ISSN
0364-9024

No coin nor oath required. For personal study only.

✦ Synopsis


We show that, for r = 1, 2, a graph G with 2n + 2 (26) vertices and maximum degree 2n + 1 -r is of Class 2 if and only if (E(G\v)I > ('"2+')m, where v is a vertex of G of minimum degree, and we make a conjecture for 1 s r s n, of which this result is a special case. For r = 1 this result is due to Plantholt.


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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