Dimensionality Reduction, Svd, Singular Values, Matrix Factorization, Eigenvectors.
https://www.youtube.com/watch?v=biW3S9EdE4w Null Space — https://www.cliffsnotes.com/study-guides/algebra/linear-algebra/real-euclidean-vector-spaces/the-nullspace-of-a-matrix Calculating null space — http://www.math.odu.edu/~bogacki/cgi-bin/lat.cgi Mining Of Massive Datasets —