向量的夹角概念在高维欧氏空间E￣n中的推广

GENERALIZATION OF THE CONCEPT OF ANGLE IN EUCLIDEAN HIGHER SPACE E￣n

本文给出了Ｅ￣ｎ中不同维数平面之间多维角、单维角的定义，它们是向量的夹角概念的推广，其几何意义非常明显，在此基础上还给出了Ｑ＿（ＡＢ）Ｐ￣（－１）Ａ的特征多项式各项系数的几何意义，这些结论对于研究各类曲率非常有用．

In the paper we give definitions of single dimensional angle and multi dimensional an-gle for two distinet dimensional planes. Their geometric significance is quite clear,and geo-metric significance of coefficients in eigenpolynomial of Q_(AB) be helpful to study curvature