In an infinite dimensionalspace there always exist two subspaces whose vector sum is different from their span.
在一无限空间中恒存在两个子空间,其矢量和与其张成空间不同。
2
By using backward difference of space-time intensity correlation function with respect to time delay, the two-dimensional velocity vector of a moving diffuser can be measured.
利用远场时变散斑空-时强度相关函致的有限差商可以测量散射体运动的二维速度矢量。
3
It is hard to draw in two dimensions a picture of a vector function in three-dimensionalspace.