Can the Multigrid method be applied to solve a linear system of equations in the form $Ax=b$, that is not necessarily related to differential equations?
Can I use multigrid to solve linear algebra problems that do not arise from a differential equation?
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There are "Algebraic Multigrid Methods" that can be applied to general systems $Ax=b$.
Brian Borchers
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If $A$ is symmetric positive definite (SPD), is it possible to use the AMG method as a preconditioner for the conjugate gradient method? – Abdelhafid Elharoussi Dec 09 '16 at 15:51
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2Yes, you could try AMG as a preconditioner. – Brian Borchers Dec 09 '16 at 15:57