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physical laws discovered by science.
| Name | Partial Differential form |
| Gauss's law: | <math>\nabla \cdot \mathbf{D} = \rho <math> |
| Gauss's law for magnetism: | <math>\nabla \cdot \mathbf{B} = 0<math> |
| Faraday's law of induction: | <math>\nabla \times \mathbf{E} = -\frac{\partial \mathbf{B}} {\partial t}<math> |
| Ampere's law + Maxwell's extension: | <math>\nabla \times \mathbf{H} = \mathbf{J} + \frac{\partial \mathbf{D}} {\partial t}<math> |
\mu \left( \nabla^2 \mathbf{u} + {1 \over 3} \nabla (\nabla \cdot \mathbf{u} ) \right) + \rho \mathbf{u} = \rho \left( { \partial\mathbf{u} \over \partial t } + \mathbf{u} \cdot \nabla \mathbf{u} \right) <math>