User:Nic bor

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\frac{\partial\mathbf u}{\partial t} +{\mathbf v}\cdot \nabla\mathbf u +\mathbf u * \nabla \cdot {\mathbf v} =d \nabla^2\mathbf u $$



\frac{\partial\mathbf u}{\partial t} +{\mathbf v}\cdot \nabla\mathbf u = 0 $$



\frac {D\mathbf u} {Dt} \equiv \frac{\partial\mathbf u}{\partial t} +{\mathbf v}\cdot \nabla\mathbf u $$



\frac {D\mathbf u} {Dt} =0 $$