We introduce an iterative method named Gpmr (general partitioned minimum residual) for solving 2x2 block unsymmetric linear systems. Gpmr is based on a new process that simultaneously reduces two r…
We develop a trust-region method for minimizing the sum of a smooth term (f) and a nonsmooth term (h), both of which can be nonconvex. Each iteration of our method minimizes a possibly nonconvex mo…