phymath999
Friday, February 22, 2013
ustc 二维的笛卡尔正交系可以抽出两个正交量从而形成两个所谓的“码”,那么如果有一个正交系有N个正交量,那么不就是说有N个“码”了吗
http://staff.ustc.edu.cn/~phj/Classical_Mechanics/1_1.pdf
坐标
2
x
′
等于两个投影之
http://blog.csdn.net/dog250/article/details/6420427
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