Given data X=[X1,X2,,Xn], The mean value is 0 - Follow the lecture note Kernel PCA _06_selftaught -Kernal_PCA.pdf Another derivation method of PCA Formula, And discuss and "PCA with only dot" Connection of derivation process - That is, the eigenvector V solved by PCA is the linear combination of Xi where V=i=1niXi, Derive of PCA formula