One of the essential dilemmas in our lives is choosing between what is urgent and what is important. Years ago, Stephen Covey placed both issues on a 2x2 matrix, giving new light by having us consider ...

If $A = (a_{ij})$ is an $n \times n$ irreducible matrix, then there are positive numbers $d_1, d_2, \cdots, d_n$ so that $\sum_k d_ia_{ik}d^{-1}_k = \sum_k d_ka_{ki}d ...

We propose efficient preconditioning algorithms for an eigenvalue problem arising in quantum physics, namely, the computation of a few interior eigenvalues and their associated eigenvectors for ...

Seems like GE on a 2x2 matrix should be pretty darn fast.... especially if you use scalar * vector type operations.