| Preface | p. ix |
| Preliminaries | p. 1 |
| Sets, set systems, and partially ordered sets | p. 1 |
| Graphs | p. 4 |
| Metric spaces | p. 13 |
| Computational complexity | p. 19 |
| Encoding X-trees | p. 21 |
| X-trees | p. 21 |
| Encoding X-trees with splits | p. 23 |
| Encoding X-trees with metrics | p. 26 |
| Encoding X-trees with quartets | p. 27 |
| Consistency of X-tree encodings | p. 31 |
| The 4-point condition | p. 31 |
| Compatibility | p. 38 |
| Quartet systems | p. 42 |
| From split systems to networks | p. 50 |
| The Buneman graph | p. 51 |
| The Buneman graph of a compatible split system | p. 59 |
| Median networks | p. 63 |
| Split networks | p. 65 |
| Split graphs and metrics: The theory of X-nets | p. 72 |
| From metrics to networks: The tight span | p. 75 |
| The tight span | p. 75 |
| A canonical contraction from P(D) onto T(D) | p. 82 |
| The tight span of a finite metric space | p. 87 |
| Networks from tight spans | p. 93 |
| Network realizations of metrics | p. 97 |
| Optimal and hereditarily optimal realizations | p. 100 |
| From quartet and tree systems to trees | p. 104 |
| On quartet systems | p. 105 |
| On set and tree systems | p. 113 |
| Constructing trees from quartet, tree, and set systems | p. 118 |
| Slim tree systems | p. 121 |
| Definitive set systems | p. 128 |
| From metrics to split systems and back | p. 137 |
| Buneman splits | p. 137 |
| Weakly compatible split systems | p. 146 |
| From weighted split systems to bivariate maps | p. 161 |
| The Buneman complex and the tight span | p. 167 |
| Maps to and from quartet systems | p. 171 |
| A Galois connection between split and quartet systems | p. 171 |
| A map from quartets to metrics | p. 177 |
| Transitive quartet systems | p. 180 |
| Rooted trees and the Farris transform | p. 195 |
| Rooted X-trees, clusters, and triplets | p. 198 |
| Dated rooted X-trees and hierarchical dissimilarities | p. 202 |
| Affine versus projective clustering and the combinatorial Farris transform | p. 205 |
| Hierarchical dissimilarities, hyperbolic maps, and their Farris transform | p. 209 |
| Hierarchical dissimilarities, generalized metrics, and the tight-span construction | p. 214 |
| Algorithmic issues | p. 218 |
| On measuring and removing inconsistencies | p. 222 |
| k-compatibility | p. 222 |
| A-hierarchical approximations | p. 230 |
| Quartet-Joining and QNet | p. 236 |
| Commonly used symbols | p. 242 |
| Bibliography | p. 253 |
| Index | p. 261 |
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