Encyclopedia of Distances Part I. Mathematics of Distances 1 General Definitions 2 Topological Spaces 3 Generalization of Metric Spaces 4 Metric Transforms 5 Metrics on Normed Structures Part II. Geometry and Distances 6 Distances in Geometry 7 Riemannian and Hermitian Metrics 8 Distances on Surfaces and Knots 9 Distances on Convex Bodies Cones and Simplicial Complexes Part III. Distances in Classical Mathematics 10 Distances in Algebra 11 Distances on Strings and Permutations 12 Distances on Numbers Polynominals and Matrices 13 Distances in Functional Analysis 14 Distances in Probability Theory Part IV. Distances in Applied Mathematics 15 Distances in Graph theory 16 Distances in Coding Theory 17 Distances and Similarities in Data Analysis 18 Distances in Systems and Mathematical Engineering Part V. Computer Related Distances 19 Distances on Real and Digital Planes 20 Voronoi Diagram Distances 21 Image and Audio Distances 22 Distances in Networks Part VI. Distances in Natural Sciences 23 Distances in Biology 24 Distances in Physics and Chemistry 25 Distances in Earth Science and Astronomy 26 Distances in Cosmology and Theory of Relativity Part VII. Real World Distances 27 Length Measures and Scales 28 Distances in Applied Social Sciences 29 Other Distances. This updated and revised second edition of the leading reference volume on distance metrics includes a wealth of new material that reflects advances in a field now regarded as an essential tool in many areas of pure and applied mathematics. The publication of this volume coincides with intensifying research efforts into metric spaces and especially distance design for applications. Accurate metrics have become a crucial goal in computational biology image analysis speech recognition and information retrieval. Leaving aside the practical questions that arise during the selection of a ‘good’ distance function this work focuses on providing the research community with an invaluable comprehensive listing of the main available distances. As well as providing standalone introductions and definitions the encyclopedia facilitates swift cross referencing with easily navigable bold faced textual links to core entries. In addition to distances themselves the authors have collated numerous fascinating curiosities in their Who’s Who of metrics including distance related notions and paradigms that enable applied mathematicians in other sectors to deploy research tools that non specialists justly view as arcane. In expanding access to these techniques and in many cases enriching the context of distances themselves this peerless volume is certain to stimulate fresh research.