参考链接:https://blog.csdn.net/hellocsz/article/details/91486679
参考链接:https://blog.csdn.net/appleyuchi/article/details/78170424
参考链接:https://www.cnblogs.com/dudu1992/p/9112054.html
参考链接:https://www.cnblogs.com/dudu1992/p/9112054.html
参考链接:https://www.zhihu.com/question/36514939/answer/67810216
参考链接:https://blog.csdn.net/Sun7_She/article/details/77199844
一、格拉姆矩阵
n维空间中任意k个向量之间两两的内积