Interface  Description 

Preconditioner 
Preconditioning reduces the condition number of the
coefficient matrix of a linear system to accelerate the convergence
when the system is solved by an iterative method.

PreconditionerFactory 
This constructs a new instance of
Preconditioner for a coefficient matrix. 
Class  Description 

IdentityPreconditioner 
This identity preconditioner is used when no preconditioning is applied.

JacobiPreconditioner 
The Jacobi (or diagonal) preconditioner is one of the simplest forms of
preconditioning, such that the preconditioner is the diagonal of
the coefficient matrix, i.e., P = diag(A).

SSORPreconditioner 
SSOR preconditioner is derived from a symmetric coefficient matrix A
which is decomposed as
A = D + L + L^{t}
The SSOR preconditioning matrix is defined as
M = (D + L)D^{1}(D + L)^{t}
or, parameterized by ω
M(ω) = (1/(2  ω))(D / ω + L)(D / ω)^{1}(D / ω + L)^{t}

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