Similar to the Jacobi method, the Gauss-Seidel method (GS) solves each equation in sequential order.
The Jacobi method solves sequentially n equations in a linear system Ax = b in isolation in each iteration.
The Successive Overrelaxation method (SOR), is devised by applying extrapolation to the Gauss-Seidel method.
The Symmetric Successive Overrelaxation method (SSOR) is like SOR, but it performs in each iteration one forward sweep followed by one backward sweep.
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