By R. Balakrishnan, K. Ranganathan

ISBN-10: 1461445299

ISBN-13: 9781461445296

Graph conception skilled a major progress within the twentieth century. one of many major purposes for this phenomenon is the applicability of graph concept in different disciplines corresponding to physics, chemistry, psychology, sociology, and theoretical machine technological know-how. This textbook offers a fantastic historical past within the simple issues of graph conception, and is meant for a complicated undergraduate or starting graduate direction in graph theory.

This moment version comprises new chapters: one on domination in graphs and the opposite at the spectral homes of graphs, the latter together with a dialogue on graph power. The bankruptcy on graph shades has been enlarged, protecting extra subject matters corresponding to homomorphisms and colorations and the distinctiveness of the Mycielskian as much as isomorphism. This publication additionally introduces a number of fascinating issues similar to Dirac's theorem on k-connected graphs, Harary-Nashwilliam's theorem at the hamiltonicity of line graphs, Toida-McKee's characterization of Eulerian graphs, the Tutte matrix of a graph, Fournier's facts of Kuratowski's theorem on planar graphs, the facts of the nonhamiltonicity of the Tutte graph on forty six vertices, and a concrete software of triangulated graphs.

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**Additional info for A Textbook of Graph Theory (2nd Edition) (Universitext)**

**Sample text**

V/ D d. 1). 6 Automorphism of a Simple Graph 19 Fig. u7 / D u7 on degree consideration. 2. 3. 4. 5. v// D N. 7 Line Graphs Let G be a loopless graph. G/, and hence we assume in this section that G has no isolated vertices. We also assume that G has no loops. G/ of a graph G follow: 1. G/ is connected. 2. G/: 3. G/: 4. v/ 2: 5. G/ v1 e1 v2 e2 v4 e4 e5 e3 e7 v7 v3 v6 e6 v5 G Fig. 1. 2. 1. The line graph of a simple graph G is a path if and only if G is a path. Proof. Let G be the path Pn on n vertices.

Iii) u1 D v1 and/or u2 D v2 : We use, with respect to any graph, the symbols E; N; and D to denote adjacency (edge), nonadjacency (no edge), and equality of vertices, respectively. v1 ; v2 / of G1 G2 : Since each ı can take two options, there are in all 28 D 256 graph products G1 G2 that can be defined using G1 and G2 : 2 3 a11 a12 a13 If S D 4a21 D a23 5 ; then the edge-nonedge entry of S will correspond to a31 a32 a33 the nonedge-edge entry of the structure matrix of G2 G1 : Hence, the product is commutative, that is, G1 and G2 commute under if and only if the double array S is symmetric.

Show that for each positive integer n 3; there exists a nonHamiltonian tournament of order n (that is, a tournament not containing a spanning directed cycle). 5. 6. 1. G/ is partitioned into k nonempty subsets V1 ; V2 ; : : : ; Vk ; such that the induced subgraphs GŒV1 ; GŒV2 ; : : : ; GŒVk are all totally disconnected. It is said to be complete if, for i ¤ j; each vertex of Vi is adjacent to every vertex of Vj ; 1 Ä i; j Ä k: A k-partite tournament is an oriented complete k-partite graph (see Fig.