给出了球构形的定义,并在S^2上用共轴这一等价关系给出了它的一种分类方法。研究了特殊r共轴球构形的性质,在此基础上给出了这类特殊球构形的特征多项式和区域个数的计算公式。
The definition of a sphere arrangement is given and a kind of classification method is obtained under the equivalence relation of "coaxality" in S^2 . Some properties of a special r coaxial sphere arrangement have been studied. The formulas to compute its characteristic polynomial and the number of regions are given.