What Other Iterative Methods Can Be Used If A is Not Positive Definite?

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When the matrix A is not positive definite, alternative iterative methods to the conjugate gradient method include the GMRES (Generalized Minimal Residual) method and the BiCGSTAB (Biconjugate Gradient Stabilized) method. These methods are suitable for solving non-symmetric or indefinite systems. Additionally, preconditioning techniques can enhance the convergence of these iterative methods. It is essential to analyze the properties of matrix A to choose the most effective approach. Exploring these options can lead to successful solutions for the equation Ax=B.
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I am dealing with a problem,which can be formulated Ax=B,in the first place I wanted to solve it with conjugate gradient method.BUt A is not positive definite.Which are the other iterative options in this case?
 
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