By R. Balakrishnan, K. Ranganathan

This moment variation contains new chapters: one on domination in graphs and the opposite at the spectral houses of graphs, the latter including a dialogue on graph energy. The bankruptcy on graph colours has been enlarged, overlaying extra subject matters similar to homomorphisms and colors and the individuality of the Mycielskian as much as isomorphism.

This publication additionally introduces numerous fascinating themes equivalent 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 program of triangulated graphs.

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Then ¢-I(V') is a vertex of G 1 incident to both e, and ej so that e, and e j are adjacent vertices of L( G 1). Thus, e, and e j are adjacent vertices of L(G'> if, and only if, B(ei) and B(ej) are adjacent vertices of L(G 2). Hence B is an isomorphism of L(Gh onto L(G 2). 2 is not true . 3 and K3. Theirline graphs are K 3. 3 whereas there is no such vertex in K3. 4 shows that the above two graphs are the only two exceptional simple graphs of this type. 4* (H. Whitney) Let G and G' be simple connected graphs with isomorphic line graphs.

3-regular) connected graph G has a cut vertex if, and only if, it ha s a cut edge. Proof Let G have a cut vertex vo. Let Vt, V2 , V3 be the vertices of G that are adjacent to Vo in G. Consider G-vo, which has either two or three components. If G-vo has three components, no two of VI , V2 , and V3 can belong to the same component of G-vo. In this case, each of VoVt. VOV2, and VOV3 is a cut edge of G. ) In the case when G-vo has only two components, one of the vertices, say VI , belongs to one component of G-vo, and V2 and V3 belong to the other component.

An ordered triple (u , u, w) of vertices of T is a transitive triple of T if whenever (u , v ) E A(T) and (u , w) E A (T) , then (u , w) E A(T) . 8. 6 1. If v is any vertex of T and u , ware two outne ighbors of v , then {u , v, w} determines a unique transitive triple in T. Such a transitive triple is said to be defined by the vertex v. Clearly, any transitive triple of T is defined by some vertex of T . Further, the number of transitive triples defined by v is ( S~») . 2. The number of directed 3-cycle s in a tournament T of order n is obtained by subtracting the total number of transitive triples of vertices of T from the total number of triples of vertice s of T .