Linear Algebra, Matrix, Matrix Decomposition, Eigenvectors, Pca.
decomposition has its advantage in a sense that Q is orthogonal and it is easier to calculate inverse of A. Then, we can rewrite A=Q⋅Λ⋅QT. Imagine calculating an inverse of Q with a very high dimension. The fact that you have another option A=Q⋅Λ⋅QT will be of great relief. 2. Singular Value