By W. D. Wallis

Concisely written, mild advent to graph concept compatible as a textbook or for self-study Graph-theoretic functions from assorted fields (computer technology, engineering, chemistry, administration technology) 2d ed. contains new chapters on labeling and communications networks and small worlds, in addition to elevated beginner's fabric Many extra alterations, advancements, and corrections due to school room use

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**Additional resources for A Beginner's Guide to Graph Theory**

**Example text**

We prove (i) ::::} (ii), (ii) ::::} (iii) and (iv) ::::} (i). ) (i) ::::} (ii) Assume G is a block. Suppose x and y are distinct vertices of G, and write X for the set of all vertices other than x that lie on a cycle passing through x. Since G has at least three vertices and no cutpoint, it contains no bridge. So every vertex adjacent to x is in X, and X is not empty. Assume y is not in X; we shall derive a contradiction. Select a vertex z in X such that the distance d (y, z) is minimal; let Po be a shortest y-z path, and write PI and P2 for the two disjoint x-z paths that make up a cycle containing x and z.

I) G + ac (iii) G + ago (v) G + cg. (ii) G + ae. (iv) G + ceo (vi) G+eg. Show that G itself is not Hamiltonian. 14 Eleven people plan to have dinner together on a number of different occasions. They sit at a round table. No person has the same neighbor at any two different dinners. A(i) Show that this can be done for 5 days. (ii) Generalize to the case of any prime number 2n + 1 of people, and n days. (iii) Find a solution for 9 people and 4 days. 3, later, for a general solution. 6 The Traveling Salesman Problem Suppose a traveling saleman wishes to visit several cities.

2 shows P4 and Cs. Fig. 2. P4 and Cs As an extension of the idea of a proper subgraph, we shall define a proper tree to be a tree other than K l , and similarly define a proper path. 3(i). What is the length of each? What is the distance from s to t? 3(i). 22 2. Walks, Pathsand Cycles s b d s a b c ISISl IZSIX1 a ct (i) d ef t (ii) Fig. 3. 3(ii). 4 Find the distances between all pairs of vertices in the graph of Figure 2. 1. 4 shows the Petersen graph, which arises in several contexts in the study of graphs.