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Sur la contraction des graphes orientes en K∗3

✍ Scribed by P Duchet; V Kaneti

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
203 KB
Volume
65
Category
Article
ISSN
0012-365X

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📜 SIMILAR VOLUMES

Sur la contractibilité d'un graphe orien
Sur la contractibilité d'un graphe orienté en K∗4
✍ Pierre Duchet; Viktor Kaneti 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 853 KB

We prove that every directed graph with n vertices and at least k-8 arcs admits the complete symmetric digraph of order 4 as a minor. The result is sharp. This answers a question raised by Meyniel (1983). We conclude with some open problems.

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## Abstract The rates of racemisation, under constant conditions of pH and temperature, of two series of ketones with an asymmetric C‐atom in α have been determined. As would be expected, substituents in the α position to the keto group influence the rate of racemisation, and it has been found poss