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Divergence ( $\nabla \cdot$ )

For

F = (F_{1}, F_{2}, F_{3})

in Cartesian coordinates,

\nabla \cdot F = \partial_{i} F_{i} = \frac{\partial F _{1}}{\partial x} + \frac{\partial F _{2}}{\partial y} + \frac{\partial F _{3}}{\partial z} .

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