# Inverses and pseudoinverses. Numerical issues, speed, symmetry.

The matrix inverse is a cornerstone of linear algebra, taught, along with its applications, since high school. The inverse of a matrix $latex A$, if it exists, is the matrix $latex A\^{-1}$ such that $latex AA\^{-1} = A\^{-1}A = I_n$. Based on the requirement that the left and …