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<p>residual (the <b>Krylov sequence</b>).The approximations to the solution are then formed by minimizing the residual over the subspace formed.The prototypical method in this class is the <a href="page.php?w=conjugate_gradient_method">conjugate gradient method</a> (CG) which assumes that the system matrix  is <a href="page.php?w=Symmetric_matrix">symmetric</a> <a href="page.php?w=Positive-definite_matrix">positive-definite</a>.For symmetric (and possibly indefinite)  one works with the <a href="page.php?w=minimal_residual_method">minimal residual method</a></p><p>
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