By Lars Dovling Andersen, Ivan Tafteberg Jakobsen, Carsten Thomassen, Bjarne Toft and Preben Dahl Vestergaard (Eds.)

ISBN-10: 0444871292

ISBN-13: 9780444871299

This quantity is a tribute to the lifestyles and mathematical paintings of G.A. Dirac (1925-1984). one of many major graph theorists, he built equipment of serious originality and made many basic discoveries. The forty-two papers are all enthusiastic about (or on the topic of) Dirac's major strains of analysis. a few mathematicians pay tribute to his reminiscence through offering new leads to diversified parts of graph conception. one of the subject matters integrated are paths and cycles, hamiltonian graphs, vertex colouring and significant graphs, graphs and surfaces, edge-colouring, and limitless graphs. a few of the papers have been initially awarded at a gathering held in Denmark in 1985. Attendance being by way of invitation merely, a few fifty five mathematicians from 14 nations participated in quite a few lectures and discussions on graph idea relating to the paintings of Dirac. This quantity comprises contributions from others in addition, so shouldn't be appeared basically because the lawsuits of that assembly. A difficulties part is integrated, in addition to a list of Dirac's personal courses.

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Nr ; if n1 = . . = nr =: s, we abbreviate this to Ksr . ) Graphs of the form K1,n are called stars. ,nr Ksr star = Fig. 2. Three drawings of the bipartite graph K3,3 = K32 Clearly, a bipartite graph cannot contain an odd cycle, a cycle of odd length. 1. A graph is bipartite if and only if it contains no odd cycle. 2 ] Proof . Let G = (V, E) be a graph without odd cycles; we show that G is bipartite. Clearly a graph is bipartite if all its components are bipartite or trivial, so we may assume that G is connected.

3, T has n − 1 edges, so m − n + 1 edges of G lie outside T . For each of these m − n + 1 edges e ∈ E E(T ), the graph T + e contains a cycle Ce (see Fig. 1 (iv)). Since none of the edges e lies on Ce for e = e, these m − n + 1 cycles are linearly independent. 3). Since none of the edges e ∈ T lies in De for e = e, these n − 1 cuts are linearly independent. 3) 24 1. The Basics e Fig. 3. The cut De incidence matrix The incidence matrix B = (bij )n×m of a graph G = (V, E) with V = { v1 , . . , vn } and E = { e1 , .

Show that the elements of the cycle space of a graph G are precisely the unions of the edges sets of edge-disjoint cycles in G. 28 1. The Basics 25. Given a graph G, find among all cuts of the form E(v) a basis for the cut space of G. 26. Prove that the cycles and the cuts in a graph together generate its entire edge space, or find a counterexample. 27. 6 generate the cycle space. 28. 6 generate the cut space. 29. What are the dimensions of the cycle and the cut space of a graph with k components?

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Graph Theory in Memory of G.A. Dirac by Lars Dovling Andersen, Ivan Tafteberg Jakobsen, Carsten Thomassen, Bjarne Toft and Preben Dahl Vestergaard (Eds.)


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