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Modern graph theory

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TLDR
This book presents an account of newer topics, including Szemer'edi's Regularity Lemma and its use; Shelah's extension of the Hales-Jewett Theorem; the precise nature of the phase transition in a random graph process; the connection between electrical networks and random walks on graphs; and the Tutte polynomial and its cousins in knot theory.
Abstract
The time has now come when graph theory should be part of the education of every serious student of mathematics and computer science, both for its own sake and to enhance the appreciation of mathematics as a whole. This book is an in-depth account of graph theory, written with such a student in mind; it reflects the current state of the subject and emphasizes connections with other branches of pure mathematics. The volume grew out of the author's earlier book, Graph Theory -- An Introductory Course, but its length is well over twice that of its predecessor, allowing it to reveal many exciting new developments in the subject. Recognizing that graph theory is one of several courses competing for the attention of a student, the book contains extensive descriptive passages designed to convey the flavor of the subject and to arouse interest. In addition to a modern treatment of the classical areas of graph theory such as coloring, matching, extremal theory, and algebraic graph theory, the book presents a detailed account of newer topics, including Szemer\'edi's Regularity Lemma and its use, Shelah's extension of the Hales-Jewett Theorem, the precise nature of the phase transition in a random graph process, the connection between electrical networks and random walks on graphs, and the Tutte polynomial and its cousins in knot theory. In no other branch of mathematics is it as vital to tackle and solve challenging exercises in order to master the subject. To this end, the book contains an unusually large number of well thought-out exercises: over 600 in total. Although some are straightforward, most of them are substantial, and others will stretch even the most able reader.

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Journal ArticleDOI

Exact Potts Model Partition Functions for Strips of the Triangular Lattice

TL;DR: In this paper, exact calculations of the Potts model partition function Z(G,q,v) for arbitrary q and temperature-like variable v on n-vertex strip graphs G of the triangular lattice for a variety of transverse widths equal to L vertices and for arbitrarily great length equal to m vertices, with free longitudinal boundary conditions and free and periodic transverse boundary conditions.
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Large planar subgraphs in dense graphs

TL;DR: It is proved that for all positive γ every sufficiently large graph G with minimum degree at least (2/3+γ)|G| contains a triangulation as a spanning subgraph, whereas this need not be the case when the minimum degree is less than 2|G|/3.
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Topological order from quantum loops and nets

TL;DR: In this article, the authors define models of quantum loops and nets that have ground states with topological order, and they make possible excited states comprised of deconfined anyons with non-abelian braiding.
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Graphs determined by polynomial invariants

TL;DR: This paper surveys known results in this area and presents some new results in what extent any of these polynomials determines a graph and how to find graphs that can be uniquely determined by a given polynomial.
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A normal law for matchings

TL;DR: This work gives asymptotic normality for any sequence of regular graphs (of positive degree) or graphs with perfect matchings, and suggests numerous related questions, some of which are discussed in the last section.