BiconjugateGradientSolver 
The Biconjugate Gradient method (BiCG) is useful for solving nonsymmetric
nbyn linear systems.

BiconjugateGradientStabilizedSolver 
The Biconjugate Gradient Stabilized (BiCGSTAB) method is useful for solving
nonsymmetric nbyn linear systems.

ConjugateGradientNormalErrorSolver 
For an underdetermined system of linear equations, Ax = b, or
when the coefficient matrix A is nonsymmetric and nonsingular,
the normal equation matrix AA^{t} is symmetric and
positive definite, and hence CG is applicable.

ConjugateGradientNormalResidualSolver 
For an underdetermined system of linear equations, Ax = b, or
when the coefficient matrix A is nonsymmetric and nonsingular,
the normal equation matrix AA^{t} is symmetric and
positive definite, and hence CG is applicable.

ConjugateGradientSolver 
The Conjugate Gradient method (CG) is useful for solving a symmetric nbyn
linear system.

ConjugateGradientSquaredSolver 
The Conjugate Gradient Squared method (CGS) is useful for solving
a nonsymmetric nbyn linear system.

GeneralizedConjugateResidualSolver 
The Generalized Conjugate Residual method (GCR) is useful for solving
a nonsymmetric nbyn linear system.

GeneralizedMinimalResidualSolver 
The Generalized Minimal Residual method (GMRES) is useful for solving a nonsymmetric nbyn
linear system.

MinimalResidualSolver 
The Minimal Residual method (MINRES) is useful for solving a symmetric nbyn linear system
(possibly indefinite or singular).

QuasiMinimalResidualSolver 
The QuasiMinimal Residual method (QMR) is useful for solving a nonsymmetric nbyn linear
system.

SteepestDescentSolver 
The Steepest Descent method (SDM) solves a symmetric nbyn linear system.
