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\frac{\partial (\rho \phi)}{\partial t} + \nabla \, ( \rho \, {\bf u}) = \rho \cdot \sum_k q_k(t) \cdot \delta({\bf r}-{\bf r}_k) |
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\phi frac{\, c_t \, \frac{\partial ppartial (\rho \phi)}{\partial t} + \nabla \, ( {\bf u} + c \cdotrho \, {\bf u}) \,= \nablarho \, pcdot = \sum_k q_k(t) \cdot \delta({\bf r}-{\bf r}_k) |
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