Divergence

• Flow field transports mass $v:{\mathbb{R}}^3\to {\mathbb{R}}^3$
• Increase/loss of mass at point p
• $di{v}_v:{\mathbb{R}}^3\to \mathbb{R}=\nabla \cdot v=\frac{\partial v_x}{\partial x}+\frac{\partial v_y}{\partial y}+\frac{\partial v_z}{\partial z}$
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