dnaupd - Interface for the Implicitly Restarted Arnoldi Iteration, to compute approximations to a few eigenpairs of a real linear operator
dsaupd - Interface for the Implicitly Restarted Arnoldi Iteration, to compute approximations to a few eigenpairs of a real and symmetric linear operator
gmres - generalized minimum residual method with restarts
pcg - precondioned conjugate gradient
qmr - quasi minimal resiqual method with preconditioning