CMRH method (Changing minimal residual with Hessenberg process) is an iterative

method for solving nonsymmetric linear systems. This method is similar to QMR method

but based on the Hessenberg process instead of the Lanczos process...

of the Krylov subspace through

the block Hessenberg process. To accelerate the convergence of the block CMRH method,

we will introduce two new methods. First, we present the block CMRH method with

weighting strategy. In this method...