This tract provides a compact introduction to the theory of proximity
spaces and their generalisations, making the subject accessible to
readers having a basic knowledge of topological and uniform spaces, such
as can be found in standard textbooks. Two chapters are devoted to
fundamentals, the main result being the proof of the existence of the
Smirnov compactification using clusters. Chapter 3 discusses the
interrelationships between proximity spaces and uniform spaces and
contains some of the most interesting results in the theory of proximity
spaces. The final chapter introduces the reader to several generalised
forms of proximity structures and studies one of them in detail. The
bibliography contains over 130 references to the scattered research
literature on proximity spaces, in addition to general references.