| 1. | In order to obtain an unique valuation , we must add new pricing criterions , and the different pricing criterions will lead to different approximate valuation , but from the point of the theory of hilbert space , no matter what kinds of approximate valuation , they can be view as the project of a vector from the hilbert space to its closed subspace , the only difference is the different definitions of norm
为了得到唯一定价，必须引入其它定价标准，引入定价标准不同，就可以得到不同的近似定价，但从hilbert空间投影理论看，无论何种近似定价，都可以看成是hilbert空间的一个向量到它的一个闭子空间投影，差别只是所定义范数不同而已。 |
