In this paper we study perturbations of the stiffly weighted pseudoinverse ${\left( {{W^{\frac{1} {2}}}A} \right)^\dag }{W^{\frac{1}{2}}}$ and the related stiffly weighted least squares problem, where ...

The study of condition numbers and perturbation analysis in least squares problems has become a cornerstone in numerical linear algebra, underpinning the reliability and accuracy of solutions to ...

Some least-squares mixed finite element methods for convection-diffusion problems, steady or nonstationary, are formulated, and convergence of these schemes is ...