The mixed finite element multigrid method for stokes equations.The stable finite element discretization of the Stokes problem produces a symmetric indefinite system of linear algebraic equations. 
the mixed finite element multigrid method
This paper investigates one of such iterative solvers, the geometric multigrid solver, to find the approximate solution of the indefinite systems. 
the geometric multigrid solver
We study the multigrid method with the following smoothers: distributed Gauss Seidel, inexact Uzawa, preconditioned MINRES, and Braess-Sarazin type smoothers. 
MINRES