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Packings and realizations of degree sequences with specified substructures.

机译:具有指定子结构的度数序列的打包和实现。

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摘要

This thesis focuses on the intersection of two classical and fundamental areas in graph theory: graph packing and degree sequences. The question of packing degree sequences lies naturally in this intersection, asking when degree sequences have edge-disjoint realizations on the same vertex set. The most significant result in this area is Kundu's k-Factor Theorem, which characterizes when a degree sequence packs with a constant sequence. We prove a series of results in this spirit, and we particularly search for realizations of degree sequences with edge-disjoint 1-factors.;Perhaps the most fundamental result in degree sequence theory is the Erdos-Gallai Theorem, characterizing when a degree sequence has a realization. After exploring degree sequence packing, we develop several proofs of this famous theorem, connecting it to many other important graph theory concepts.;We are also interested in locating edge-disjoint 1-factors in dense graphs. Before tackling this question, we build on the work of Katerinis to find the largest k such that a graph has a k-factor, where the value of k depends on the minimum degree of the graph. This gives an upper bound on the number of edge-disjoint 1-factors.;The question of finding edge-disjoint 1-factors leads us to a conjecture of Bollobas and Scott about finding spanning balanced bipartite subgraphs with vertices of high degree. We first prove a degree-sequence version of the Bollobas--Scott Conjecture which we apply to the question of edge-disjoint 1-factors. We then generalize and prove an approximate version of the conjecture, yielding balanced partitions with many edges going to each part. This version has many applications, including finding edge-disjoint 1-factors and edge-disjoint Hamiltonian cycles.
机译:本文着眼于图论中两个经典和基本领域的交集:图堆积和度数序列。打包度数序列的问题自然存在于此交点中,询问度数序列何时在同一顶点集上具有边不相交的实现。该区域最重要的结果是昆度的k因子定理,该定理表征度数序列以恒定序列堆积的情况。我们本着这种精神证明了一系列结果,尤其是寻找具有边不相交的1因子的度数序列的实现。;也许度数序列理论中最基本的结果是Erdos-Gallai定理,它描述了度数序列何时具有实现。在探索度数序列堆积之后,我们开发了这个著名定理的若干证明,并将其与许多其他重要的图论概念相联系。;我们也对在稠密图中定位边不相交的1因子感兴趣。在解决这个问题之前,我们以Katerinis的工作为基础,找到最大的k,使得图具有k因子,其中k的值取决于图的最小程度。这为边不相交的1因子的数量提供了一个上限。查找边不相交的1因子的问题使我们对Bollobas和Scott提出了一个猜想,即寻找具有高阶顶点的跨越平衡二分图。我们首先证明Bollobas-Scott猜想的度数序列版本,我们将其应用于边不相交的1因子问题。然后,我们泛化并证明该猜想的一个近似版本,产生平衡的分区,每个部分都有许多边。该版本具有许多应用程序,包括查找边不相交的1因子和边不相交的哈密顿循环。

著录项

  • 作者

    Seacrest, Tyler.;

  • 作者单位

    The University of Nebraska - Lincoln.;

  • 授予单位 The University of Nebraska - Lincoln.;
  • 学科 Theoretical Mathematics.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 140 p.
  • 总页数 140
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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