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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Almost Regular Graphs And Edge Face Colorings Of Plane Graphs

Macon, Lisa 01 January 2009 (has links)
Regular graphs are graphs in which all vertices have the same degree. Many properties of these graphs are known. Such graphs play an important role in modeling network configurations where equipment limitations impose a restriction on the maximum number of links emanating from a node. These limitations do not enforce strict regularity, and it becomes interesting to investigate nonregular graphs that are in some sense close to regular. This dissertation explores a particular class of almost regular graphs in detail and defines generalizations on this class. A linear-time algorithm for the creation of arbitrarily large graphs of the discussed class is provided, and a polynomial-time algorithm for recognizing graphs in the class is given. Several invariants for the class are discussed. The edge-face chromatic number χef of a plane graph G is the minimum number of colors that must be assigned to the edges and faces of G such that no edge or face of G receives the same color as an edge or face with which it is incident or adjacent. A well-known result for the upper bound of χef exists for graphs with maximum degree Δ ≥ 10. We present a tight upper bound for plane graphs with Δ = 9.

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