https://blogs.sas.com/content/iml/2012/08/16/extract-the-lower-triangular-elements-of-a-matrix.html
Extract the lower triangular elements of a matrix - The DO Loop
It is common to want to extract the lower or upper triangular elements of a matrix.
lower triangulardo loopextractelementsmatrix
https://mst.elsevierpure.com/en/publications/global-disturbance-rejection-of-lower-triangular-systems-with-an-/
Global disturbance rejection of lower triangular systems with an unknown linear exosystem -...
lower triangularglobaldisturbancerejectionsystems
https://joteo.net/math-calculators/cholesky-decomposition-calculator/
Cholesky Decomposition Calculator — Find Lower Triangular Matrix L
Compute the Cholesky factorization of any symmetric positive-definite matrix. Enter a 2×2, 3×3, or 4×4 matrix and get the lower triangular matrix L where A =...
lower triangular matrixcholesky decompositioncalculatorfind