《离散群几何(英文)》主要内容简介：This text is intended to serve as an introduction to the geometry of the action of discrete groups of Mobius transformations. The subject matter has now been studied with changing points of emphasis for over a hundred years, the most recent developments being connected with the theory of 3-manifolds:see, for example, the papers of Poincare [77] and Thurston [101]. About 1940, the now well-known （but virtually unobtainable） FencheI-Nielsen manuscript appeared. Sadly, the manuscript never appeared in print, and this more modest text attempts to display at least some of the beautiful geo-metrical ideas to be found in that manuscript, as well as some more recent material.