paragraph_text: <tr> <td colspan=4><strong>Netrivijalne kombinacije vektorskih operacija:</strong> <ol> <li><math>\operatorname{div\ grad\ } f = \nabla \cdot (\nabla f) = \nabla^2 f = \Delta f</math> (laplasijan) <li><math>\operatorname{rot\ grad\ } f = \nabla \times (\nabla f) = \mathbf{0}</math> <li><math>\operatorname{div\ rot\ } \mathbf{A} = \nabla \cdot (\nabla \times \mathbf{A}) = 0</math> <li><math>\operatorname{rot\ rot\ } \mathbf{A} = \nabla \times (\nabla \times \mathbf{A}) = \nabla (\nabla \cdot \mathbf{A}) - \nabla^2 \mathbf{A}</math> <li><math>\Delta f g = f \Delta g + 2 \nabla f \cdot \nabla g + g\Delta f</math> </ol>