Symmetric successive over-relaxation

In applied mathematics, symmetric successive over-relaxation (SSOR), is a preconditioner.

If the original matrix can be split into diagonal, lower and upper tridiagonal as ${\displaystyle A=D+L+L^{T}}$ then SSOR preconditioner matrix is defined as

It can also be parametrised by ${\displaystyle \omega }$ as follows.

...
Wikipedia