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Bolian Liu's Matrices in Combinatorics and Graph Theory (Network Theory PDF

By Bolian Liu

ISBN-10: 0792364694

ISBN-13: 9780792364696

The 1st bankruptcy of this e-book presents a quick remedy of the fundamentals of the topic. the opposite chapters take care of a number of the decompositions of non-negative matrices, Birkhoff sort theorems, the research of the powers of non-negative matrices, functions of matrix the right way to different combinatorial difficulties, and purposes of combinatorial easy methods to matrix difficulties and linear algebra difficulties. The insurance of must haves has been stored to a minimal. however, the e-book is essentially self-contained (an Appendix presents the required history in linear algebra, graph thought and combinatorics). there are lots of routines, all of that are followed through sketched options. viewers: The e-book is acceptable for a graduate path in addition to being an exceptional reference and a priceless source for mathematicians operating within the quarter of combinatorial matrix concept.

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Extra resources for Matrices in Combinatorics and Graph Theory (Network Theory and Applications Volume 3)

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3 Traveling Around the Globe In a graph setting, the TSP is NP-complete, and it is not difficult to see that this is also the case for the MaxTSP: If M is a sufficiently large number, replacing each edge weight c(e) of a TSP instance by M − c(e) yields a MaxTSP instance with the same optimal tours. But how can we use this simple idea of inverting short and long edges in a geometric setting? In fact, Theorem 2 indicates that this may not even be possible. The key idea lies in switching from the plane to a sphere, and to consider Euclidean distances.

Now the interesting question is whether this characterizing ordering can also be applied for solving optimization problems of this class of graphs. Good candidates for such optimization problems are the Hamiltonian path and cycle as well as the minimum coloring problem, which both can be solved in polynomial time on cocomparability graphs but are still open for the class of AT-free graphs. References 1. : Independent sets in asteroidal triple-free graphs. SIAM J. Discret. Math. 12(2), 276–287 (1999) 2.

Discret. Appl. Math. 79(1–3), 171–188 (1997) Finding Longest Geometric Tours Sándor P. Fekete Abstract We discuss the problem of finding a longest tour for a set of points in a geometric space. In particular, we show that a longest tour for a set of n points in the plane can be computed in time O(n) if distances are determined by the Manhattan metric, while the same problem is NP-hard for points on a sphere under Euclidean distances. 1 Introduction: Short and Long Roundtrips The Traveling Salesman Problem (TSP) is one of the classic problems of combinatorial optimization.

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Matrices in Combinatorics and Graph Theory (Network Theory and Applications Volume 3) by Bolian Liu

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