《国外数学名著系列(续一)(影印版)58:几何4(非正规黎曼几何)》主要内容：This volume of the Encyclopaedia contains two articles which give a survey of modern research into non-regular Riemannian geometry，carried out mostly by Russian mathematicians．
The first article written by Reshetnyak is devoted to the theory of two-dimensional Riemannian manifolds of bounded curvature．Concepts of Riemannian geometry such as the area and integral curvature of a set and the length and integral curvature of a curve are also defined for these manifolds．Some fundamental results of Riemannian geometry like the Gauss．Bonnet formula are true in the more general case considered in the book．
The second article by Berestovskij and Nikolaev is devoted to the theory of metric spaces whose curvature lies between two giyen constants．The main result iS that these spaces are in fact Riemannian． This result has important applications in global Riemannian geometry．
Both parts cover topics which have not yet been treated in monograph form．Hence the book will be immensely useful to graduate students and researchers in geometry，in particular Riemannian geometry．
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