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\[ \nabla \cdot \mathbf{D} = \rho_f\\ \nabla \cdot \mathbf{B} = 0,\\ \nabla \times \mathbf{E} = -\frac{\partial\mathbf{B}}{\partial t}\\ \nabla \times \mathbf{H} = \mathbf{J}_f - \frac{\partial\mathbf{D}}{\partial t}. \]

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