# Proceedings of the First Japan Conference on Graph Theory by J. Akiyama, Y. Egawa and H. Enomoto (Eds.)

By J. Akiyama, Y. Egawa and H. Enomoto (Eds.)

**Read or Download Proceedings of the First Japan Conference on Graph Theory and Applications, Hakone, Japan, June 1-5, 1986 PDF**

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**Extra info for Proceedings of the First Japan Conference on Graph Theory and Applications, Hakone, Japan, June 1-5, 1986**

**Sample text**

An operational state of G corresponds to a state of each cutset in which each has at least one operational edge, although the converse need not hold. Hence the probability that each cutset has at least one operational edge is an upper bound on the reliability of G. This can be easily evaluated, as the cutsets are edge-disjoint. The bound is improved by taking more cutsets, and cutsets which are more likely to fail; again, these two goals may be conflicting. We consider the simplest case of requiring an edge-packing by a maximum number of cutsets.

This can be seen from the graphs Gl and G2in Fig. 1. It is easy to see, in fact, that for any graph G, Y ' ( W = B d G ) 6 B-(G) B + W = Bl(G) where y'(G) is the edge domination number of G. 2),(3,419 ( 5 3 6 ) ) . Next, we let S = V ( G )and let X E S have property P if and only if X contains no closed neighborhood of G. e. a minimal dominating set of G. The cardinalities of a largest and a smallest minimal dominating set are denoted T ( G ) and y(G), respectively. Let flf(G) and fl;(C) denote the cardinality of largest and smallest P-sets, respectively.

T. HEDETNIEMI* Department of Computer Science, Clemson University R. LASKAR* Department of Mathematical Sciences, Clemson University Received 30 September 1986 Revised 18 March 1987 1. Introduction In 1959 Gallai [4] presented his now classical theorem, involving the vertex covering number ao, the vertex independence number Po, the edge covering number a l , and the maximum matching (or edge independence) number B1. Theorem 1 (Gallai). For any nontrivial, connected graph G = ( V , E ) with p vertices, I.