By R. Balakrishnan, K. Ranganathan

ISBN-10: 1461445299

ISBN-13: 9781461445296

Graph thought skilled a major development within the twentieth century. one of many major purposes for this phenomenon is the applicability of graph concept in different disciplines resembling physics, chemistry, psychology, sociology, and theoretical machine technological know-how. This textbook offers a superior historical past within the uncomplicated themes of graph concept, and is meant for a sophisticated 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 houses of graphs, the latter together with a dialogue on graph strength. The bankruptcy on graph colours has been enlarged, masking extra subject matters similar to homomorphisms and shades and the individuality of the Mycielskian as much as isomorphism. This ebook additionally introduces a number of attention-grabbing subject matters 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 evidence of the nonhamiltonicity of the Tutte graph on forty six vertices, and a concrete software of triangulated graphs.

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**Extra resources for A Textbook of Graph Theory (2nd Edition) (Universitext)**

**Sample text**

2. 3. Join of two graphs: Let G1 and G2 be two vertex-disjoint graphs. 26 illustrates the graph G1 _ G2 : If G1 D K1 and G2 D Cn ; then G1 _ G2 is called the wheel Wn : W5 is shown in Fig. 27. G2 /: 26 1 Basic Results Fig. 26 G1 _ G2 v1 u1 G1 : G2 : v2 v4 u2 v3 v1 u1 G1 ∨ G2: v2 v4 u2 v3 Fig. 9 Graph Products We now define graph products. Denote a general graph product of two simple graphs by G H: We define the product in such a way that G H is also simple. v1 ; v2 / of G1 G2 ; consider the following possibilities: (i) u1 adjacent to v1 in G1 or u1 nonadjacent to v1 in G1 .

Prove that the deletion of edges of a minimum-edge cut of a connected graph G results in a disconnected graph with exactly two components. 3. G/ r: An r-connected (respectively, r-edge-connected) graph is also `-connected (respectively, `-edge connected) for each `; 0 Ä ` Ä r 1: For the graph G of Fig. 4. G/: 54 3 Connectivity Fig. 5 A 1-connected graph G Fig. 6 Graph G with Ä D 1; D 2 and ı D 3 G Proof. We observe that Ä D 0 if and only if D 0: Also, ı D 0 implies that Ä D 0 and D 0: Hence we may assume that Ä; ; and ı are all at least 1: Let E be an edge cut of G with edges.

P C 1/cycle containing u (see Fig. 5b). T / for each i; 0 Ä i Ä p 1g: The diconnectedness of T implies that none of S; S 0 ; and ŒS; S 0 is empty. p C 1/-cycle of T containing vp 1 D u (see Fig. 5c). 3. 2 shows, in particular, that every diconnected tournament is Hamiltonian; that is, it contains a directed spanning cycle. 1. 2. Show that a tournament is diconnected if and only if it has a spanning directed cycle. 3. 4. 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).

### A Textbook of Graph Theory (2nd Edition) (Universitext) by R. Balakrishnan, K. Ranganathan

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