引入了分式线性变换的一种推广形式,讨论了其也可把圆映为圆.并把此变换利用实数形式推广到了n维空间,接着讨论了此变换在n维空间中的球几何和微分度量.
By introducing a kind of generalization of fractional linear transformation, it is discussed that the method can also map a circle into another. Moreover, the transformation is generalized to the n-dimensional space by the real number form, then the geometry of the sphere and the differential metric of the transformation in the n-dimensional space are discussed.