This book is a study of an aspect of Elie Cartan's contribution to thequestion "What is geometry?"
In the last century two great generalizations of Euclidean geometry ap-peared. The first was the discovery of the non-Euclidean geometries. Thesewere organized into a coherent whole by Felix Klein, who recognized themas various examples of coset spaces G/H of Lie groups. In this book we refer to these latter as Klein geometries. The second generalization was Georg Riemann's discovery of what we now call Riemannian geometry. These two theories seemed largely incompatible with one other.1
In the early 1920s Elie Cartan, one of the pioneers of the theory of Lie groups, found that it was possible to obtain a common generalization of these theories, which he called espaces generalizes and we call Cartan geometries (see diagram).
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评分1870年德国数学家克莱因(Felix Klein)在德国埃尔朗根大学作就职演讲时,阐述了他的《埃尔朗根纲领》,用变换群对已有的几何学进行了分类。在《埃尔朗根纲领》发表后的半个世纪内,它成了几何学的指导原理,推动了几何学的发展,导致了射影微分几何、仿射微分几何、共形微分几何的建立。特别是射影微分几何起始于1878年阿尔方的学位论文,后来1906年起经以威尔辛斯基为代表的美国学派所发展,1916年起又经以富比尼为首的意大利学派所发展。在仿射微分几何方面,布拉施克(W. Blaschke)也做出了决定性的工作。
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