Graph Coloring Problems
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Graph Coloring Problems
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Author : Tommy R. Jensen
language : en
Publisher: John Wiley & Sons
Release Date : 2011-10-24
Graph Coloring Problems written by Tommy R. Jensen and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-10-24 with Mathematics categories.
Contains a wealth of information previously scattered in research journals, conference proceedings and technical reports. Identifies more than 200 unsolved problems. Every problem is stated in a self-contained, extremely accessible format, followed by comments on its history, related results and literature. The book will stimulate research and help avoid efforts on solving already settled problems. Each chapter concludes with a comprehensive list of references which will lead readers to original sources, important contributions and other surveys.
Graph Colouring And Applications
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Author : Pierre Hansen
language : en
Publisher: American Mathematical Soc.
Release Date : 1999
Graph Colouring And Applications written by Pierre Hansen and has been published by American Mathematical Soc. this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Mathematics categories.
This volume presents the proceedings of the CRM workshop on graph coloring and applications. The articles span a wide spectrum of topics related to graph coloring, including: list-colorings, total colorings, colorings and embeddings of graphs, chromatic polynomials, characteristic polynomials, chromatic scheduling, and graph coloring problems related to frequency assignment. Outstanding researchers in combinatorial optimization and graph theory contributed their work. A list of open problems is included.
Graph Colorings
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Author : Marek Kubale
language : en
Publisher: American Mathematical Soc.
Release Date : 2004
Graph Colorings written by Marek Kubale and has been published by American Mathematical Soc. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Mathematics categories.
Graph coloring is one of the oldest and best-known problems of graph theory. Statistics show that graph coloring is one of the central issues in the collection of several hundred classical combinatorial problems. This book covers the problems in graph coloring, which can be viewed as one area of discrete optimization.
A Guide To Graph Colouring
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Author : R.M.R. Lewis
language : en
Publisher: Springer
Release Date : 2015-10-26
A Guide To Graph Colouring written by R.M.R. Lewis and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-10-26 with Computers categories.
This book treats graph colouring as an algorithmic problem, with a strong emphasis on practical applications. The author describes and analyses some of the best-known algorithms for colouring arbitrary graphs, focusing on whether these heuristics can provide optimal solutions in some cases; how they perform on graphs where the chromatic number is unknown; and whether they can produce better solutions than other algorithms for certain types of graphs, and why. The introductory chapters explain graph colouring, and bounds and constructive algorithms. The author then shows how advanced, modern techniques can be applied to classic real-world operational research problems such as seating plans, sports scheduling, and university timetabling. He includes many examples, suggestions for further reading, and historical notes, and the book is supplemented by a website with an online suite of downloadable code. The book will be of value to researchers, graduate students, and practitioners in the areas of operations research, theoretical computer science, optimization, and computational intelligence. The reader should have elementary knowledge of sets, matrices, and enumerative combinatorics.
On Various Graph Coloring Problems
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Author : Dimitri Lajou
language : en
Publisher:
Release Date : 2021
On Various Graph Coloring Problems written by Dimitri Lajou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Heuristic Algorithms For Graph Coloring Problems
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Author : Wen Sun
language : en
Publisher:
Release Date : 2018
Heuristic Algorithms For Graph Coloring Problems written by Wen Sun and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
This thesis concerns four NP-hard graph coloring problems, namely, graph coloring (GCP), equitable coloring (ECP), weighted vertex coloring (WVCP) and k-vertex-critical subgraphs (k-VCS). These problems are extensively studied in the literature not only for their theoretical intractability, but also for their real-world applications in many domains. Given that they belong to the class of NP-hard problems, it is computationally difficult to solve them exactly in the general case. For this reason, this thesis is devoted to developing effective heuristic approaches to tackle these challenging problems. We develop a reduction memetic algorithm (RMA) for the graph coloring problem, a feasible and infeasible search algorithm (FISA) for the equitable coloring problem, an adaptive feasible and infeasible search algorithm (AFISA) for the weighted vertex coloring problem and an iterated backtrack-based removal (IBR) algorithm for the k-VCS problem. All these algorithms were experimentally evaluated and compared with state-of-the-art methods.
Graph Colorings With Local Restrictions
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Author : Peter Bradshaw
language : en
Publisher:
Release Date : 2022
Graph Colorings With Local Restrictions written by Peter Bradshaw and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
A graph coloring is an assignment of a label, usually called a color, to each vertex of a graph. In nearly all applications of graph coloring, the colors on a graph's vertices must avoid certain forbidden local configurations. In this thesis, we will consider several problems in which we aim to color the vertices of a graph while obeying more complex local restrictions presented to us by an adversary. The first problem that we will consider is the list coloring problem, in which we seek a proper coloring of a graph in which every vertex receives a color from a prescribed list given to that vertex by an adversary. We will consider this problem specifically for bipartite graphs, and we will take a modest step toward a conjecture of Alon and Krivelevich on the number of colors needed in the list at each vertex of a bipartite graph in order to guarantee the existence of a proper list coloring. The second problem that we will consider is single-conflict coloring, in which we seek a graph coloring that avoids a forbidden color pair prescribed by an adversary at each edge. We will prove an upper bound on the number of colors needed for a single-conflict coloring in a graph of bounded degeneracy. We will also consider a special case of this problem called the cooperative coloring problem, and we will find new results on cooperative colorings of forests. The third problem that we will consider is the hat guessing game, which is a graph coloring problem in which each coloring of the neighborhood of a vertex v determines a single forbidden color at v, and we aim to color our graph so that no vertex receives the color forbidden by the coloring of its neighborhood. We will prove that the number of colors needed for such a coloring in an outerplanar graph is bounded, and we will extend our method to a large subclass of planar graphs. Finally, we will consider the graph coloring game, a game in which two players take turns properly coloring the vertices of a graph, with one player attempting to complete a proper coloring, and the other player attempting to prevent a proper coloring. We will show that if a graph G has a proper coloring in which the game coloring number of each bicolored subgraph is bounded, then the game chromatic number of G is bounded. As a corollary, we will obtain upper bounds for the game chromatic numbers of certain graph products and answer a question of X. Zhu.
Distributed Graph Coloring
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Author : Leonid Barenboim
language : en
Publisher: Springer Nature
Release Date : 2022-06-01
Distributed Graph Coloring written by Leonid Barenboim and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-06-01 with Computers categories.
The focus of this monograph is on symmetry breaking problems in the message-passing model of distributed computing. In this model a communication network is represented by a n-vertex graph G = (V,E), whose vertices host autonomous processors. The processors communicate over the edges of G in discrete rounds. The goal is to devise algorithms that use as few rounds as possible. A typical symmetry-breaking problem is the problem of graph coloring. Denote by ? the maximum degree of G. While coloring G with ? + 1 colors is trivial in the centralized setting, the problem becomes much more challenging in the distributed one. One can also compromise on the number of colors, if this allows for more efficient algorithms. Other typical symmetry-breaking problems are the problems of computing a maximal independent set (MIS) and a maximal matching (MM). The study of these problems dates back to the very early days of distributed computing. The founding fathers of distributed computing laid firm foundations for the area of distributed symmetry breaking already in the eighties. In particular, they showed that all these problems can be solved in randomized logarithmic time. Also, Linial showed that an O(?2)-coloring can be solved very efficiently deterministically. However, fundamental questions were left open for decades. In particular, it is not known if the MIS or the (? + 1)-coloring can be solved in deterministic polylogarithmic time. Moreover, until recently it was not known if in deterministic polylogarithmic time one can color a graph with significantly fewer than ?2 colors. Additionally, it was open (and still open to some extent) if one can have sublogarithmic randomized algorithms for the symmetry breaking problems. Recently, significant progress was achieved in the study of these questions. More efficient deterministic and randomized (? + 1)-coloring algorithms were achieved. Deterministic ?1 + o(1)-coloring algorithms with polylogarithmic running time were devised. Improved (and often sublogarithmic-time) randomized algorithms were devised. Drastically improved lower bounds were given. Wide families of graphs in which these problems are solvable much faster than on general graphs were identified. The objective of our monograph is to cover most of these developments, and as a result to provide a treatise on theoretical foundations of distributed symmetry breaking in the message-passing model. We hope that our monograph will stimulate further progress in this exciting area.
Various Coloring Problems On Plane Graphs
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Author : Ching-Man Li
language : en
Publisher: Open Dissertation Press
Release Date : 2017-01-27
Various Coloring Problems On Plane Graphs written by Ching-Man Li and has been published by Open Dissertation Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-01-27 with categories.
This dissertation, "Various Coloring Problems on Plane Graphs" by Ching-man, Li, 李靜文, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled VARIOUS COLORING PROBLEMS ON PLANE GRAPHS submitted by LI Ching Man for the degree of Master of Philosophy at The University of Hong Kong in July 2007 Partitioning a set of objects into classes according to certain rules is a funda- mental process in mathematics. A conceptually simple set of rules tells us for each pair of objects whether or not they are allowed in the same class. The theory of graph coloring deals with exactly this situation. Graphcoloringhasalonghistory, andfromtheverybeginningithasbeenclosely tied to the famous Four-Color conjecture, which asserts that every plane map can be colored with four colors so that no two regions with common boundary segment receive the same color. In addition to its great theoretical interest, graph coloring can be found in many important real-world applications- time tabling, sequencing, scheduling problems, and so on, in their many forms, are essentially graph coloring problems. Since the graph coloring problem is NP-hard in general, there is no polynomial- time algorithm for solving it exactly unless NP = P. So a common practice is to restrictourattentiontosomespecialclassesofgraphs. MotivatedbytheFour-Color conjecture, plane graphs have received tremendous research efforts. The present thesis is devoted to the graph coloring problem and its variations on plane graphs. To be specific, the proofs of the following theorems have been presented: 1. Every plane graph containing at most three triangles is 3-colorable; 2. Every plane graph is 5-choosable; 3. Every plane graph with girth at least 5 is 3-choosable;4. Every plane graph with maximum degree Δ>= 9 is Δ-edge colorable. Theproofsofthetheoremsareallconstructiveandyieldpolynomial-timealgorithms for solving the corresponding graph coloring problems. DOI: 10.5353/th_b3900654 Subjects: Graph coloring
Coloring Mixed Hypergraphs Theory Algorithms And Applications
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Author : Vitaly Ivanovich Voloshin
language : en
Publisher: American Mathematical Soc.
Release Date : 2002
Coloring Mixed Hypergraphs Theory Algorithms And Applications written by Vitaly Ivanovich Voloshin and has been published by American Mathematical Soc. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Mathematics categories.
The theory of graph coloring has existed for more than 150 years. Historically, graph coloring involved finding the minimum number of colors to be assigned to the vertices so that adjacent vertices would have different colors. From this modest beginning, the theory has become central in discrete mathematics with many contemporary generalizations and applications. Generalization of graph coloring-type problems to mixed hypergraphs brings many new dimensions to the theory ofcolorings. A main feature of this book is that in the case of hypergraphs, there exist problems on both the minimum and the maximum number of colors. This feature pervades the theory, methods, algorithms, and applications of mixed hypergraph coloring. The book has broad appeal. It will be of interest to bothpure and applied mathematicians, particularly those in the areas of discrete mathematics, combinatorial optimization, operations research, computer science, software engineering, molecular biology, and related businesses and industries. It also makes a nice supplementary text for courses in graph theory and discrete mathematics. This is especially useful for students in combinatorics and optimization. Since the area is new, students will have the chance at this stage to obtain results that maybecome classic in the future.
