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### Picard method
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The Picard method is a simple fixed point method applied on the equation $`\mathbf{F}(\mathbf{x})=0`$ when the nonlinear function is of the form $`\mathbf{F}(\mathbf{x}) := \mathbf{A}(\mathbf{x}) \mathbf{x} - \mathbf{b}`$. Given an initial guess $`\mathbf{x}_0`$, Picard's method consists in computing the successive iterates $`\mathbf{x}_k`$ such that
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When the nonlinear function is of the form $`\mathbf{F}(\mathbf{x}) := \mathbf{A}(\mathbf{x}) \mathbf{x} - \mathbf{b}`$, given an initial guess $`\mathbf{x}_0`$, Picard's method consists in computing the successive iterates $`\mathbf{x}_k`$ such that
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```math
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\mathbf{A}(\mathbf{x}_{k-1}) \mathbf{x}_k = \mathbf{b},
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\quad k = 1, 2, ...
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