Every basis of a linear space contains the same number of vectors. 一線性空間的每一基底包含同樣數目的向量。
As for the undivided linear sample space, the kernel function is needed to map onto another high dimension linear space. 對於線性不可分的樣本空間,需要尋找核函數,將線性不可分的樣本集映射到另一個高維線性空間。